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[Q] Using the verizon variant internationally

Hi,
Just bought today the verizon variant of the galaxy s6, and I need help with a couple of questions:
I'm moving to Europe in the near future, would I still be able to use the phone?
From who do I get software updates? Will I get updates from verizon even if I'm abroad?
Would it be able to flash international firmware on this phone in the future? Are the models fundamentally different from each other or are they just handicapped by firmware?
Thanks in advance

yuviyuval said:
Hi,
Just bought today the verizon variant of the galaxy s6, and I need help with a couple of questions:
I'm moving to Europe in the near future, would I still be able to use the phone?
From who do I get software updates? Will I get updates from verizon even if I'm abroad?
Would it be able to flash international firmware on this phone in the future? Are the models fundamentally different from each other or are they just handicapped by firmware?
Thanks in advance
Click to expand...
Click to collapse
Yes it works internationally, I'm using it on GSM right now and plan to use it in Egypt over the summer. You will get updates but I think verizon needs a verizon sim to check for updates but when one releases you can always check through a computer if you need to. As far as I know verizon one is the bay because it supports CDMA radios and GSM radios and comes pre unlocked while other versions like tmobile only support gsm. That's the only hardware difference, the rest is all software.
Also be careful with your phone! Nor sure where in Europe yuppie going but some classes visited Spain recently and lots of them we're pickpocketed and had something stopen.
Sent from my Verizon S6,
formerly abdel12345

supersmash19 said:
Yes it works internationally, I'm using it on GSM right now and plan to use it in Egypt over the summer. You will get updates but I think verizon needs a verizon sim to check for updates but when one releases you can always check through a computer if you need to. As far as I know verizon one is the bay because it supports CDMA radios and GSM radios and comes pre unlocked while other versions like tmobile only support gsm. That's the only hardware difference, the rest is all software.
Also be careful with your phone! Nor sure where in Europe yuppie going but some classes visited Spain recently and lots of them we're pickpocketed and had something stopen.
Sent from my Verizon S6,
formerly abdel12345
Click to expand...
Click to collapse
So just to clarify, I can just purchase an EE nano sim card from amazon, take my s6 to london, pop it in, and it should work? I don't have to call Verizon before hand to get it network unlocked?

voldyy said:
So just to clarify, I can just purchase an EE nano sim card from amazon, take my s6 to london, pop it in, and it should work? I don't have to call Verizon before hand to get it network unlocked?
Click to expand...
Click to collapse
Correct. You may have to set up apns for data though. But text and voice should work out the box.

What can I do to use the GSM network, 3G !!!!
I live in china

zintung2911 said:
What can I do to use the GSM network, 3G !!!!
I live in china
Click to expand...
Click to collapse
3G only for China Unicom. Add the APN of Unicom and then H+ will work.

voldyy said:
So just to clarify, I can just purchase an EE nano sim card from amazon, take my s6 to london, pop it in, and it should work? I don't have to call Verizon before hand to get it network unlocked?
Click to expand...
Click to collapse
920V is different from the international version. It supports very few LTE bands and i'm not sure it supports as many 2g/3g bands as the internation one. you may have voice but you won't have LTE.

toskabab said:
Correct. You may have to set up apns for data though. But text and voice should work out the box.
Click to expand...
Click to collapse
Hi,
Didn't u have the same issue with texting?
I bought my s6 from verizon on a trip in the USA, but I live in UK and using 3 network. The only issue is the texting. I spent lot of time to figure out what is the real problem, and it seems like it is sort of prefix problem. If I receive message from someone with new number with +4407 (obviously all of them start) and I reply, message is not going to be sent and I always get a message: " Your text to speech message to 0114407..... has been rejected by recipient phone." I never use text speech btw, and it definitely prefix problem because if I send to 07... only they receive it. I changed all my contacts to 07... but still after that I couldn't reply to messages for a long time just only with the Handcent next sms app. But If I receive a new message from a new number I'll get with +447.. and I need to save it and change the number to 07.. otherwise it will never work. I found some people had the same issue in the past, but there was no final solutions: http://forum.xda-developers.com/showthread.php?t=2106370
http://thedroidguy.com/2015/07/solutions-for-samsung-galaxy-s4-sms-mms-problems-part-2-110209
I am just wondering how is this gonna work abroad if I even can't use in the UK. I rooted and put clear rom, but still same.

toskabab said:
Correct. You may have to set up apns for data though. But text and voice should work out the box.
Click to expand...
Click to collapse
How do I add a new APN? I found Settings -> Mobile networks -> Access Point Names but the "Add" button is greyed out

I am seeing it greyed out as well. I was planning on getting UK 3 sim cards for our trip next year.
Sent from my SM-G920V using XDA Free mobile app

SM-N920R US Cellular (International) work on Verizon

I am trying to buy the international SM-N920R version of a Note 5 so I can root it.
Will it work on Verizon? I found out that it will work on all of Verizon's bands from this site willmyphonework.net but just want to double tap to ensure I am not wasting my money because just because it should work on Verizon's network I need to know if it is Verizon approved. I don't have the Meid or the ESN to check this so does anyone know for sure? I should be able to pop my Sim from my Turbo and it should work on the international version right?

RoachHero said:
I am trying to buy the international SM-N920R version of a Note 5 so I can root it.
Will it work on Verizon? I found out that it will work on all of Verizon's bands from this site willmyphonework.net but just want to double tap to ensure I am not wasting my money because just because it should work on Verizon's network I need to know if it is Verizon approved. I don't have the Meid or the ESN to check this so does anyone know for sure? I should be able to pop my Sim from my Turbo and it should work on the international version right?
Click to expand...
Click to collapse
I highly doubt it, but I'd love to know the answer too. I'd switch phones in a heartbeat.
Sent from my SM-N920V using Tapatalk

Why do you doubt it would work? Just curious. The phone operates on all the same bands Verizon does. I could just ask Verizon permission to operate on their network, I'd rathered not. I don't see why it wouldn't work after I throw my SIM in it, but if it doesn't I can ask permission. The only carrier that Verizon says outright no to is Sprint.

I kinda doubt it'll work, but I'm very interested as well, if it works, I'd switch right away.

RoachHero said:
I am trying to buy the international SM-N920R version of a Note 5 so I can root it.
Will it work on Verizon? I found out that it will work on all of Verizon's bands from this site willmyphonework.net but just want to double tap to ensure I am not wasting my money because just because it should work on Verizon's network I need to know if it is Verizon approved. I don't have the Meid or the ESN to check this so does anyone know for sure? I should be able to pop my Sim from my Turbo and it should work on the international version right?
Click to expand...
Click to collapse
It doesn't have band 13 which I think is Verizon's main LTE band

I wonder if the OP has tried it and gotten it to work.
Sent from my SM-N920V using Tapatalk

RoachHero said:
I am trying to buy the international SM-N920R version of a Note 5 so I can root it.
Will it work on Verizon? I found out that it will work on all of Verizon's bands from this site willmyphonework.net but just want to double tap to ensure I am not wasting my money because just because it should work on Verizon's network I need to know if it is Verizon approved. I don't have the Meid or the ESN to check this so does anyone know for sure? I should be able to pop my Sim from my Turbo and it should work on the international version right?
Click to expand...
Click to collapse
If its an unlocked international version and it for sure is CDMA compatible it will work on Verizon's network, and I doubt there will be any hassle connecting it other than the usual service fees. However, I highly doubt that taking your SIM card from your Turbo will actually work, as SIM cards on Verizon's CDMA network are not like the SIM cards of GSM networks where you can take and switch from phone to phone and they work. I have tried this with my phones , a Note 5 and a Note 2 and also a Google Nexus and had anywhere from limited service to no service, I think because Verizon has their SIM cards tied to the actual IMEI of the phone, at least that's my thought. But hey If it works be sure to let us know as I know I would do the same to get root.

it does work. you need to have a verizon sim card that is already active. you have to activate the sim in a verizon phone before starting. you can use any us cellular device that is unlocked on verizon. the s6 edge, edge plus , note 5 all ship unlocked. theyre gsm capable also. the only issue with gsm is that you cant edit the apn. which is what brought me here. looking for a custom rom that would allow me to do so. you get 3g only using a uscc device on verizon and no mms.
---------- Post added at 11:47 AM ---------- Previous post was at 11:40 AM ----------
LvnInOC said:
If its an unlocked international version and it for sure is CDMA compatible it will work on Verizon's network, and I doubt there will be any hassle connecting it other than the usual service fees. However, I highly doubt that taking your SIM card from your Turbo will actually work, as SIM cards on Verizon's CDMA network are not like the SIM cards of GSM networks where you can take and switch from phone to phone and they work. I have tried this with my phones , a Note 5 and a Note 2 and also a Google Nexus and had anywhere from limited service to no service, I think because Verizon has their SIM cards tied to the actual IMEI of the phone, at least that's my thought. But hey If it works be sure to let us know as I know I would do the same to get root.
Click to expand...
Click to collapse
verizon sim cards are just like gsm cards. all you have to do is put the card in your new device to switch the service. obvisouly the device would have to have a cdma radio to connect to anything other than lte service but you dont need to provide verizon with meid of your phone when switching.

bradsinram said:
it does work. you need to have a verizon sim card that is already active. you have to activate the sim in a verizon phone before starting. you can use any us cellular device that is unlocked on verizon. the s6 edge, edge plus , note 5 all ship unlocked. theyre gsm capable also. the only issue with gsm is that you cant edit the apn. which is what brought me here. looking for a custom rom that would allow me to do so. you get 3g only using a uscc device on verizon and no mms.
---------- Post added at 11:47 AM ---------- Previous post was at 11:40 AM ----------
verizon sim cards are just like gsm cards. all you have to do is put the card in your new device to switch the service. obvisouly the device would have to have a cdma radio to connect to anything other than lte service but you dont need to provide verizon with meid of your phone when switching.
Click to expand...
Click to collapse
I don't know if my experience applies here, but I did once switch a user's iPad Air 2 to verizon by just switching the SIM card to a Verizon card. This was done in conjuction with Verizon's corporate customer service who even sent me the SIM card I needed free of charge (probably because it was part of our corporate contract - assume they would probaly not do that for an individual).

I am currently on a Us Cellular r4 variant, and Using a Note 7 ported rom I messed with to work on it.
I often see the carrier on my notification tab say "Verizon"
I know that our phones are locked open, which means in the advanced system menu, ALL channels are locked open, and at least on my phone, I am able to recieve and process signal from most carriers. Our service is LTE/CDMA
I havent tried using a verizon sim to see if it works, but the r4 variant is supposedly "International"... The rom I ported was done by a Vietnamese guy...IDK. All i know is that it works after twrp restoring modem and efs

WiFi Calling on Factory Unlocked S8+

A couple of weeks back, I purchased a factory unlocked S8+ Model #G955U1, Baseband Version G955U1EU1AQE3 (The AT&T Galaxy S8+ has different Model and Build #s), inserted my AT&T SIM card and have been using it since. Then I decided to activate WiFi calling, however, unlike my wife's iPhone 7, my Galaxy does not have the option to enable WiFi calling (this option should be under Settings>Connections). After some research, I found out that this a carrier feature which AT&T must provision. When I asked them to do it, they provisioned it on my wife's iPhone 7 but not on my Galaxy, so I called them again and asked them to provision it on the Galaxy. Although they insist that they did, the feature does not show up on under AT&T Devices (It shows up under the iPhone but not the Galaxy). After spending no less than two hours speaking to three agents, I learned that AT&T does not have in their data base the IMEI number of the Galaxy because it was not purchased through them. So obviously, not having an IMEI number, the WiFi calling feature is not going to be pushed to my Galaxy. Not being able to solve the problem, they escalated it to another level who is supposed to contact me two days from now. A friend purchased his Galaxy S8+ through AT&T and the WiFi calling option is there in Settings>Connection and he is able to toggle it on or off. When I used AT&T's IMEI Verification tool, the result was "Device is compatible but we cannot find matching SIM card".
Any and all input would be appreciated.

Same here. Looks like wifi calling is not a feature that is available on the unlocked version unfortunately. Same with using LTE while on calls and built in visual voicemail :/
You have some advantages going unlocked but you lose some things too.
Sent from my iPhone using Tapatalk

But you can always use Odin to flash the ATT firmware to the unlocked device. There's plenty of threads here regarding this very subject.

Mr. Orange 645 said:
But you can always use Odin to flash the ATT firmware to the unlocked device. There's plenty of threads here regarding this very subject.
Click to expand...
Click to collapse
True, just keep in mind that future att updates can't be done via OTA - which can be a pain too.
Sent from my iPhone using Tapatalk

With the unlocked s8+ i've found that wifi calling and volte only worked on T-Mobile, I tried it with T-Mo and verizon. It stinks that ATT cant be more like T-Mo with accepting non branded devices

Poison423 said:
With the unlocked s8+ i've found that wifi calling and volte only worked on T-Mobile, I tried it with T-Mo and verizon. It stinks that ATT cant be more like T-Mo with accepting non branded devices
Click to expand...
Click to collapse
Same here. No issues with wi-fi calling on T-Mobile network. I also have the same unlocked phone.

Edited. Read the thread

Gr8man001 said:
Same here. No issues with wi-fi calling on T-Mobile network. I also have the same unlocked phone.
Click to expand...
Click to collapse
I am pleasantly surprised and a bit puzzled because when I spoke to T-Mobile Tech yesterday, she could not confirm if WiFi calling will work on unlocked S8+. If I can be assured that it will work, I will switch to T-Mobile.
Please do me a great favor and check if your unlocked S8+ has the same Model and Build Numbers as mine. Here are my numbers:
Model #G955U1
SM-G955UZKAXAA
Baseband Version G955U1EU1AQE3
Thank you.

TheBoozer said:
I am pleasantly surprised and a bit puzzled because when I spoke to T-Mobile Tech yesterday, she could not confirm if WiFi calling will work on unlocked S8+. If I can be assured that it will work, I will switch to T-Mobile.
Please do me a great favor and check if your unlocked S8+ has the same Model and Build Numbers as mine. Here are my numbers:
Model #G955U1
SM-G955UZKAXAA
Baseband Version G955U1EU1AQE3
Thank you.
Click to expand...
Click to collapse
All the information you provided matched with my phone. As a matter of fact, I also tried my friends SIM who is on MVNO called Mint Mobile that runs on T-mobile network. Mint also allowed me to make wi-fi calling. I am surprised that t-mobile rep could not confirm this feature because this feature is on by default! If I don't want to make wifi calls, I have to turn it off. The only little annoying part is that you get constant notification," Calls will be made over WiFi". Even when you block this notification, it will reappear on the reboot

Gr8man001 said:
All the information you provided matched with my phone. As a matter of fact, I also tried my friends SIM who is on MVNO called Mint Mobile that runs on T-mobile network. Mint also allowed me to make wi-fi calling. I am surprised that t-mobile rep could not confirm this feature because this feature is on by default! If I don't want to make wifi calls, I have to turn it off. The only little annoying part is that you get constant notification," Calls will be made over WiFi". Even when you block this notification, it will reappear on the reboot
Click to expand...
Click to collapse
Thank you indeed for your response. When I got my S8+ and before inserting AT&T SIM, this feature was NOT listed under Settings>Connections. I was informed by a Samsung agent that the carriers will push this feature to the phone through their SIM after they provision the feature. So now since my SIM is AT&T and my phone is unlocked, and its IMEI number is not in AT&T's data base, I don't have the feature listed.

Unfortunately, I can't comment on at&t network. On t-mobile, I did not have to do anything except during the initial setup, I was asked if I was ok to make wifi phone calls when a wifi connection was available & the signal was strong. I still have the option not to use this feature. You may wantvto visit a t-mobile store or find a friend who is on t-mobile network. It might not be a bad idea to reset the phone (after backing up) when you get the new sim card. Good luck ?

Gr8man001 said:
Unfortunately, I can't comment on at&t network. On t-mobile, I did not have to do anything except during the initial setup, I was asked if I was ok to make wifi phone calls when a wifi connection was available & the signal was strong. I still have the option not to use this feature. You may wantvto visit a t-mobile store or find a friend who is on t-mobile network. It might not be a bad idea to reset the phone (after backing up) when you get the new sim card. Good luck ?
Click to expand...
Click to collapse
Very good advice, thank you again for all your help.

on my s8+ wifi calling option is found in the phone settings , simply open the phone app hit those 3 dots , choose settings and wifi calling is at the bottom of the options .

peekie said:
on my s8+ wifi calling option is found in the phone settings , simply open the phone app hit those 3 dots , choose settings and wifi calling is at the bottom of the options .
Click to expand...
Click to collapse
I switched yesterday from AT&T to T-Mobile and immediately the wifi calling showed up in Phone Settings as you mentioned. However before switching from AT&T to T-Mobile, wifi calling was not anywhere to be found.

TheBoozer said:
I switched yesterday from AT&T to T-Mobile and immediately the wifi calling showed up in Phone Settings as you mentioned. However before switching from AT&T to T-Mobile, wifi calling was not anywhere to be found.
Click to expand...
Click to collapse
That's because WiFi calling and VoLTE are not available on ATT using the US Unlocked device. You have to either buy an ATT carrier version, or flash the ATT firmware to your current device.

Try to reset to factory defaults with sim inside
I'm on Argentina and with unlocked software i got wifi calling when the device is set up with my sim inside

Mr. Orange 645 said:
That's because WiFi calling and VoLTE are not available on ATT using the US Unlocked device. You have to either buy an ATT carrier version, or flash the ATT firmware to your current device.
Click to expand...
Click to collapse
I found that after wasting several hours with AT&T's techs. The 3rd option is to dump AT&T and switch to a carrier that has wifi calling available for unlocked S8/S8+ phones such as T-Mobile.

Wi-Fi Calling works great for me
TheBoozer said:
A couple of weeks back, I purchased a factory unlocked S8+ Model #G955U1, Baseband Version G955U1EU1AQE3 (The AT&T Galaxy S8+ has different Model and Build #s), inserted my AT&T SIM card and have been using it since. Then I decided to activate WiFi calling, however, unlike my wife's iPhone 7, my Galaxy does not have the option to enable WiFi calling (this option should be under Settings>Connections). After some research, I found out that this a carrier feature which AT&T must provision. When I asked them to do it, they provisioned it on my wife's iPhone 7 but not on my Galaxy, so I called them again and asked them to provision it on the Galaxy. Although they insist that they did, the feature does not show up on under AT&T Devices (It shows up under the iPhone but not the Galaxy). After spending no less than two hours speaking to three agents, I learned that AT&T does not have in their data base the IMEI number of the Galaxy because it was not purchased through them. So obviously, not having an IMEI number, the WiFi calling feature is not going to be pushed to my Galaxy. Not being able to solve the problem, they escalated it to another level who is supposed to contact me two days from now. A friend purchased his Galaxy S8+ through AT&T and the WiFi calling option is there in Settings>Connection and he is able to toggle it on or off. When I used AT&T's IMEI Verification tool, the result was "Device is compatible but we cannot find matching SIM card".
Any and all input would be appreciated.
Click to expand...
Click to collapse
To access Wi-Fi calling you need to open your phone app and hit the settings button in the top right corner and then scroll all the way to the bottom and it will be there.

Goldenstreak76 said:
To access Wi-Fi calling you need to open your phone app and hit the settings button in the top right corner and then scroll all the way to the bottom and it will be there.
Click to expand...
Click to collapse
Unlocked US version it isn't there on AT&T.

This is a Samsung Issue not AT&T...according to Samsung
The following is a record of your online chat.
General Info
Chat start time November 15, 2017 3:42:19 PM EST
Chat end time November 15, 2017 4:00:23 PM EST
Duration (actual chatting time) 00:18:03
Operator Rohit K
Chat Transcript
Info: Thank you for choosing to chat with us. An agent will be with you shortly.
Info: You are now chatting with Rohit K.
Rohit K: Hi, thank you for reaching out to Samsung Technical Support. How may I assist you?
You: how do i turn on HD voice on my s8+ on the att network?
Rohit K: I'll help you with the required information.
You: wi fi calling
Rohit K: Here are the steps.
Rohit K: Go to Settings. Tap Advanced Calling under WIRELESS NETWORKS. Tap Advanced Calling again to turn it On or Off.
You: I've gone through the steps outlined in your Wi-Fi calling setup but when I do the search no wi-fi calling shows up in the search
Rohit K: Just to confirm, is it a unlocked phone?
You: yes
Rohit K: Unfortunately, we cannot use the wifi calling option on the unlocked phones. Samsung is working on this issue.
You: That's odd....you would think it would work better. HOw long has it been an issue?
You: I just got my phone yesterday
Rohit K: The WiFi calling feature is disabled on the unlocked phones, as we can use any carrier on the unlocked phones.
Rohit K: You'll find it on the carrier enabled phone.
You: How can I exchange this phone for a new att phone
Rohit K: May I know the place of purchase?
You: Samsung.com
Rohit K: Yes, you can return the phone with in 15 days from the date of purchase.
Rohit K: We have a dedicated order support team, for your convenience I'll share the contact number of our dedicated team. Once contact them, they'll help you in exchanging the phone.
Rohit K: you may call us toll-free at 855-726-8721,
seven days a week, 9 a.m.-9 p.m. EST with your order
number.

Galaxy SM-930V compatiable ROM?

I have SM-930V. US Cellular will not activate because this phone is not in their unlock policy. I want to flash firmware G930R4TYU4BQE1 the phone is qualcom.
will US Cellular firmware work with the Verizon S7? Please post link with your firmware suggestion.
I did have this phone on the US Cell network a few months ago but I was experiencing signal issues. Data worked fine, but voice service was mostly unavailable.
Thank you!

US Cellular is an off-shoot of T-Mobile? I believe that is GSM.
I went to Verizon last week, and they advise they are only CDMA. I think that is incorrect, but never the less that is what I was told. I purchased a sim chip and put into my A&T compatible phone. No go. I put it into another device that works with GSM chips, and though the device saw it as a Verizon service chip, it did not get any service. I am in a really terrible spot for cell service.
I read that Verizon was coming out with GSM service, maybe earlier this year? The service reps I spoke to do not seem to be aware of it.

reahcat said:
I have SM-930V. US Cellular will not activate because this phone is not in their unlock policy. I want to flash firmware G930R4TYU4BQE1 the phone is qualcom.
will US Cellular firmware work with the Verizon S7? Please post link with your firmware suggestion.
I did have this phone on the US Cell network a few months ago but I was experiencing signal issues. Data worked fine, but voice service was mostly unavailable.
Thank you!
Click to expand...
Click to collapse
You can only flash G930V or G930U firmwares to the Verizon G930V model S7s

AT&T vs Unlocked US version

Are there any differences (Hardware like LTE, 5G Band differences or software differences) between AT&T and US Unlocked versions?

Hardware should be no difference. Radio bands should be the same. Software is different. The unlocked comes without carrier bloatware.

That is correct. The software is the only difference. I had the Samsung Note 10+ unlocked on AT&T. I couldn't get WiFi call or HD voice. This time I went the Note 20 Ultra AT&T version. Not a big deal. I just remove the bloatware from the phone using ADB. You can find articles on how to do it.

Weird that I was told by VZW that I couldn't wifi call on the unlocked version. But I can.

I had the U1 version on ATT. Worked great. Some menus missing, such as ability to choose VOLTE butncall quality was great. Has to call ATT to change to a 5g plan for 5g.

By the unlocked version, are you referring to the SM-N986B/DS? I am researching as well and I am on the AT&T network.
Edit: my bad misread title.

I had a U1 N10+ and as someone else mentioned, no wifi calling or HD Voice (VOLTE). Even flashing the U firmware. ATT typically has to Whitelist your phone to unlock those features. Running the U would unlock Video Calling (useless unless the other person is also on ATT) and Advanced Messaging (also an ATT only service). The day I got my N20Ultra, I popped my ATT activated sim, and no VOLTE / HD voice, and no wifi calling. Being on U1, the rest of the features weren't available (video calling, advanced messaging, vvm) which isn't surprising since it's debranded.
In another thread, it showed that Factory Unlocked N20Ultra will have HD Voice hut NOT wifi calling. That's fairly new, so YMMV. Saw the post earlier this week. Not sure it's it's live already or in the works. Some phones had support for WiFi calling and HD Voice, but the N20 series were showing only HD Voice at time of article.
I've since dumped att for Metro (Tmobile) for a few reasons, but primarily their reluctance for fully support a factory unlocked device. They are making a step in the right direction, but honestly, VOLTE and WiFi Calling should be standard features supported. Like why wouldn't you want me to call on wifi instead of clogging the wireless towers? Both work OOTB with Tmobile.
Edit: If you have no plans to switch carriers, I'd get it through att. Even if you run U1 for now, you can change your mind later and know all the features will work on U. If you buy factory unlocked, and need WiFi calling, there's no guarantee it'll work even if you load U firmware. In the past, the device has to have the IMEI specifically whitelisted on their end.

todd3835 said:
I had a U1 N10+ and as someone else mentioned, no wifi calling or HD Voice (VOLTE). Even flashing the U firmware. ATT typically has to Whitelist your phone to unlock those features. Running the U would unlock Video Calling (useless unless the other person is also on ATT) and Advanced Messaging (also an ATT only service). The day I got my N20Ultra, I popped my ATT activated sim, and no VOLTE / HD voice, and no wifi calling. Being on U1, the rest of the features weren't available (video calling, advanced messaging, vvm) which isn't surprising since it's debranded.
In another thread, it showed that Factory Unlocked N20Ultra will have HD Voice hut NOT wifi calling. That's fairly new, so YMMV. Saw the post earlier this week. Not sure it's it's live already or in the works. Some phones had support for WiFi calling and HD Voice, but the N20 series were showing only HD Voice at time of article.
I've since dumped att for Metro (Tmobile) for a few reasons, but primarily their reluctance for fully support a factory unlocked device. They are making a step in the right direction, but honestly, VOLTE and WiFi Calling should be standard features supported. Like why wouldn't you want me to call on wifi instead of clogging the wireless towers? Both work OOTB with Tmobile.
Edit: If you have no plans to switch carriers, I'd get it through att. Even if you run U1 for now, you can change your mind later and know all the features will work on U. If you buy factory unlocked, and need WiFi calling, there's no guarantee it'll work even if you load U firmware. In the past, the device has to have the IMEI specifically whitelisted on their end.
Click to expand...
Click to collapse
I spoke to AT&T for hours and they whitelisted my international Note20 Ultra IMEI. I still don't have Wi-Fi calling and they absolutely don't know why... I regret switching from T-Mobile to AT&T... but unfortunately have to stay with AT&T for 2 more years because of iPhone deals we got...

Guys, all you have to do is flash the U Home CSC for and you'll have all the features on ATT and still have U1 firmware on your U1 device. At least for me on this phone and two previous, the Samsung devices were already "whitelisted" with ATT

Can a US CSC be flashed to another snapdragon model, namely 9860?

ekerbuddyeker said:
Can a US CSC be flashed to another snapdragon model, namely 9860?
Click to expand...
Click to collapse
My guess is no .... But not sure

So if I have a at&t version and flash the u1 firmware would I have wifi calling?

jjr3211 said:
So if I have a at&t version and flash the u1 firmware would I have wifi calling?
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No. If you're on the AT&T version, stay there.

I can't believe AT&T would whitelist all Samsung Unlocked devices, that would really surprise me. You can buy AT&T locked Galaxy phone and unlock it with AT&T since you bought it outright, and then of course it would be whitelisted.

Still Less Features for Factory Unlocked Models?
Read through this thread and tried digging around in all other logical forums and it seems that it's still the case that one cannot get WiFi calling on AT&T with a Factory Unlocked model?
Asking because Amazon is selling the Note 20 Ultra 512GB Factory Unlocked today for $1,200.
Found a Reddit thread that has people stating there will be a Samsung update that addresses this.
Have seen various posts in various places about flashing file(s)/ROM to enable this.
Any authoritative answer as to whether WiFi Calling (and Voice Over LTE) can be enabled on AT&T with a Factory Unlocked Note 20 Ultra? Or authoritative assurance it will, soon?

haroldlundt said:
Read through this thread and tried digging around in all other logical forums and it seems that it's still the case that one cannot get WiFi calling on AT&T with a Factory Unlocked model?
Asking because Amazon is selling the Note 20 Ultra 512GB Factory Unlocked today for $1,200.
Found a Reddit thread that has people stating there will be a Samsung update that addresses this.
Have seen various posts in various places about flashing file(s)/ROM to enable this.
Any authoritative answer as to whether WiFi Calling (and Voice Over LTE) can be enabled on AT&T with a Factory Unlocked Note 20 Ultra? Or authoritative assurance it will, soon?
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Click to collapse
They cannot. Att and att based subsidized carriers. Do not allow byod on votle or wifi calling. I have a trick to make it work for a couple hours. So I know its possible. But after a few hours their systems reprovision your device and shut them back off.

TheMadScientist said:
They cannot. Att and att based subsidized carriers. Do not allow byod on votle or wifi calling. I have a trick to make it work for a couple hours. So I know its possible. But after a few hours their systems reprovision your device and shut them back off.
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Too bad. Thanks for the reply. Feel better about passing up the sale especially since it will probably be a common sale price during Xmas sales.
And WiFi Calling is too important a feature to trade for a discount of a hundred or even two.

haroldlundt said:
Too bad. Thanks for the reply. Feel better about passing up the sale especially since it will probably be a common sale price during Xmas sales.
And WiFi Calling is too important a feature to trade for a discount of a hundred or even two.
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Yea. If you provision volte and wifi on a actual att phone and sim swap they work for a while. Usually around 4 or 5 am. Then it shuts off and never works again. Till sim swap and reprovision

VoLTE on unlocked Samsung S20 and Note20 series phones is set to "on" by default, but unchangeable (greyed out). As of right now, there is no ability to select WiFi calling until Samsung decides to grace those of us with unlocked phones that ability.

haroldlundt said:
Read through this thread and tried digging around in all other logical forums and it seems that it's still the case that one cannot get WiFi calling on AT&T with a Factory Unlocked model?
Asking because Amazon is selling the Note 20 Ultra 512GB Factory Unlocked today for $1,200.
Found a Reddit thread that has people stating there will be a Samsung update that addresses this.
Have seen various posts in various places about flashing file(s)/ROM to enable this.
Any authoritative answer as to whether WiFi Calling (and Voice Over LTE) can be enabled on AT&T with a Factory Unlocked Note 20 Ultra? Or authoritative assurance it will, soon?
Click to expand...
Click to collapse
There is a long term method but it involves calling att, and getting your IMEI registered so you can get VOLTE and wifi calling. Ask customer service. I can't remember the name of the department you need to request. It takes a couple of weeks and then you suddenly get a weird sms (something like IMEI provisioned) and then it works. Did it on note 9.