The method outlined below can probably be used on other variants.
My phone started out as an unlocked Tmo S9+ - SM-G965U
Flashing the latest tmo firmware (G965USQS7ETH2) would only yield volte, not wifi calling with cricket. The exact same firmware would give volte and wifi calling withi my free freeup sim (also att based). So the device and firmware is most certainly capable of it, but there's profiles in place restricting it.
As soon as the sim was swapped to the cricket one, phone would reboot, apply csc changes and no wifi calling. Flashing the AIO CSC didn't help either. They purposely block wifi [email protected]#
So, solution is to prevent the CSC change from free up (CSC: ATT) to cricket (AIO) from taking place. But how on an unrooted device???? I decided to use the debloated factory unlocked U1 fw rather than U (less crap to disable later).
My final results is a concoction of fw pieces and some adb magic.
It is important that account/sim is already configured for volte/wifi calling. I did this over chat by providing them an iphone 8 (or 9?) IMEI and confirmed hd voice and wifi calling was enabled on the profile. Some social engineering may be needed.
I use frija to obtain all fw's.
a) Base firmware: SM-G965U1_2_20200709201504_m6wxoyd74w_fac.zip based on G965U1UEU7ETG1
CSC: TMB
Additional:
b) SM-G965U_2_20200811140304_5ohvmlyr5p_fac_G965USQS7ETH2_TMB based on latest G965USQS7ETH2 tmo firmware
CSC: TMB
1) Obtain and extract files from both of the above zips. Keep track of which is which.
2) In odin, specify everything from A except CSC. Use the CSC (home or non-home) from B. This is needed to get the advanced calling features to work. Flashing CSC from A resulted in no wifi calling (possibly no volte either, can't remember).
CSC home or non home version?
I haven't tried this with an already configured phone, will probably work too. In that case use the home version. Non home results in a factory reset.
3) You will need a sim that specifies the ATT CSC. In my case the freeup sim is identified as such in the phone info app. I imagine a deactivated or blank sim should do the trick. The goal here is to get the phone to flash the correct CSC parameters. Have this sim in the phone prior to the reboot from odin.
4) Depending on which csc used in #2, the phone may reboot to apply CSC changes, let it. We want to lock in this profile.
5) If all is right, you should see the wifi calling toggle in the quick tiles and have the options in the connections and phone settings.
6) Enable usb debugging and connect via adb shell
7) This one took forever to determine, but this is what makes it all work!
Code:
adb shell pm disable-user --user 0 com.samsung.android.cidmanager
8) Insert your cricket sim and allow to register. You will see it doesn't ask you to reboot to apply any csc changes. Under the 4636 menu it should show volte and wifi calling enabled. Make sure the wifi calling toggle is enabled
9) Reboot the phone for good measure and test again. Enable airplane mode and wifi. Try placing a call. It should go through.
Caveats: Unlike the att CSC, this one doesn't ask for an address. I'm not sure what address it's using - the one tied to the cricket account? The signal around here is good that wifi calling only kicks in in air plane mode.
Does this break something else? Possibly. Lets hope a proper fw update is released where these shenanigans are not necessary. With root, the proper CSC features can be correctly enabled for the control xml file. The battery in this phone is already at ~80% life remaining, so not willing to give up another 20%.
Good luck!
Reserved
Wifi calling uses the following ports. Make sure they're open in your firewall.
Outbound port 4500 udp
Outbound port 500 udp
Outbound port 5228 tcp
There may be others, but these were the nonstandard ones I had to explicitly define.
do you think you can use the stock U1 firmware ++ the tmo home CSC with this method?
wpcprez said:
do you think you can use the stock U1 firmware ++ the tmo home CSC with this method?
Click to expand...
Click to collapse
Why not... Try it?
gpz1100 said:
Why not... Try it?
Click to expand...
Click to collapse
strange, I used frija to download XAA and TMB firmwares but they end up being the same filename?
also, going to need to find an ATT SIM. Tried my redpocket GSMA but since it was never registered to an account it is giving me an error.
I can assure you this does not work. Your putting your sin in a cricket phone which provisions wifi calling and volte. When you insert t the sun in another phone it works for a mere hours. Then they realize your in a different device and reprovision your account again. Simply fishing cricket firmware does not fix this.
Only way to get around it is like I do.
Put your sim in a cricket phone. Provision. Swap sims. Then call them immediately and tell them your using the cricket device but it's showing your byop still and they need to change the imei to the cricket device. Then they're system will not reprovision your account again. Wifi calling will continue to work indefinitely
TheMadScientist said:
I can assure you this does not work. Your putting your sin in a cricket phone which provisions wifi calling and volte. When you insert t the sun in another phone it works for a mere hours. Then they realize your in a different device and reprovision your account again. Simply fishing cricket firmware does not fix this.
Only way to get around it is like I do.
Put your sim in a cricket phone. Provision. Swap sims. Then call them immediately and tell them your using the cricket device but it's showing your byop still and they need to change the imei to the cricket device. Then they're system will not reprovision your account again. Wifi calling will continue to work indefinitely
Click to expand...
Click to collapse
To whom are you replying? My cricket account already has a hardcoded imei on it (via customer service).
ok so not worth the trouble trying to get an ATT sim then? One thing that does work is VOLTE started working after pulling sim, putting in iphone6 enable wifi calling / volte. Swap back then volte started working and continues to work.
Related
I bought an Unlocked Canadian S6 recently, and it just won't let me connect to the LTE network.
Model Numer : SM-G920W8
Android Version : 5.0.2
Baseband : G920W8VLU1AOCG
Connecting to the LTE is not even an option. When I go in the Network Options, I get the choice between :
-WDCMA/GSM (auto connect)
- WDCMA only
- GSM only
I know for a fact that I am in the coverage zone, so no need to ask that silly question
I've tried different SIM cards, played in the options a bit, and factory reset the phone about 5 times now, yet nothing seems to work.
Also, when I try to do the update, it just reboots and gives me an Android logo and a failed Icon
I've only seen one other post like this from a carrier's support website, but no solutions were found.
**Update : For a reason, after a recovery, it will connect to the LTE for a bit or until next boot, then go back to what it is now.
First question, who did you buy the phone from? Second, Is it second hand? By default, Wind mobile does not allow the LTE option to be displayed in system settings as they as a carrier don't have LTE. It is blocked by the CSC setting for the carrier. As for other carriers It should leave you the option to connect in settings where you say it is not. If it is a Wind phone, You would need to change the CSC to enable the LTE selection. There is a method to force LTE even without option in settings, but I think it is removed in the latest firmware. Try dialing *#2263# in the dialer. It may bring you to menu that will allow you to select LTE. This is not a permanent method though as it will need to be done every boot. The other way, (If you are in fact a Wind/Mobilicity phone) is to enter dialer and enter *#272*IMEI# with IMEI being your devices unique code. If at all possible, take a full nand and Titanium Backup before doing this and be sure to transfer everything off the phone to a PC. This method wipes everything and I mean everything off the phone buy is a surefire way to enable LTE.
Yes, it was second hand. I didn't ask who was his carrier simply because it was unlocked.
I'll try it tomorrow, thanks for the information
Here is the menu you will see when you type the *#272*imei# code into your dialer. The codes are the carrier names. Mine which is GLW is Wind, BMC is Bell, RWC is Rogers, etc.
Maybe there is no LTE in your area...
roydok said:
Maybe there is no LTE in your area...
Click to expand...
Click to collapse
It would still be visible in the Settings/Mobile Networks/Network Mode menu which it is not. His problem is more than that.
BCSC said:
First question, who did you buy the phone from? Second, Is it second hand? By default, Wind mobile does not allow the LTE option to be displayed in system settings as they as a carrier don't have LTE. It is blocked by the CSC setting for the carrier. As for other carriers It should leave you the option to connect in settings where you say it is not. If it is a Wind phone, You would need to change the CSC to enable the LTE selection. There is a method to force LTE even without option in settings, but I think it is removed in the latest firmware. Try dialing *#2263# in the dialer. It may bring you to menu that will allow you to select LTE. This is not a permanent method though as it will need to be done every boot. The other way, (If you are in fact a Wind/Mobilicity phone) is to enter dialer and enter *#272*IMEI# with IMEI being your devices unique code. If at all possible, take a full nand and Titanium Backup before doing this and be sure to transfer everything off the phone to a PC. This method wipes everything and I mean everything off the phone buy is a surefire way to enable LTE.
Click to expand...
Click to collapse
Sweet! It works :good: Thanks man
Now, would you have any ideas on why the update won't work? I didn't get much into it yet, but I will soon.
I'm not sure why it wouldn't update, but now that you have changed the CSC you can download the update and flash with Odin. Pick your carrier and go to town. The guy running the following thread runs his own firmware host. He's got amazing DL speeds. Usually takes me 6 or so minutes to do the 1.6gb file. http://forum.xda-developers.com/showthread.php?t=3086387
I'm having the same issue.
Scurbs said:
Sweet! It works :good: Thanks man
Now, would you have any ideas on why the update won't work? I didn't get much into it yet, but I will soon.
Click to expand...
Click to collapse
Connected with someone selling a G920W8 version. LTE is disabled and the codes aren't working. Can you reaffirm which unlock code worked for you? I'm on Fido, what LTE network are you using?
hi BCSC
Thanks for the details. I searched complete net and read all articles but nothing set me up with the proper thing. i read your solution i dialled *#2263# and all i got is service mode and in that i went to band selection , LTE and the all ....... Yes and its showing LTE in mobile data. THanks so much.
But now another issue, network is showing perfect but no outgoing and incoming calls.
in incoming its showing busy and on outgoing its not connecting to another phone.
And, Lte is not showing in mobile networks, There only 3 options still are showing.
Mine is same Wind S6 but i had to use in India.
Let Me know
Thanks once again
Cheeerzzzzz
Varun
Picking LTE from the service mode will note make it visible from the settings menu. Its more of a workarpund instead of a way of permanently enabling it. As for the issue of no out/in calls, my best guess is that it could be due to which LTE bands are being used or are available in India. Unfortunatly I have no way to test that option. I only was successful in getting the Wind LTE option on Canadian carriers.
Sent from my SM-G935W8 using XDA-Developers mobile app
LTE+ The Easy Way!
I've been pulling out my hair trying to get LTE+ and root at the same time. I was doing something differently two days ago and couldn't figure out what it was. And then BAM! :laugh:
If you follow the BlueFox721 Carrier Switch Guide and go with unlocked firmware, let's say Att or Tmobile, you at a certain point "Echo" in the sales code for that company... like ATT or TMB. I changed mine to TMB for UNLOCKED Tmobile, but TMB is ALSO the code for LOCKED Tmobile. Basically when I would reset for SamFail, (Nearly identical to PwnFail but for Note 8) the system was seeing a US based phone, asking for a TMB setup, so I got LOCKED TMB 4GLTE
All I had to do after rooting to achieve LTE+ was:
Go through the phone setup process
Install Terminal Emulator, run TE, type SU for Super User (You have to grant it Su access, and if the SU command works the $ symbol in TE will become a #)
Then type the following:
echo "XAA" > /efs/imei/mps_code.dat
Then press return!
And then type
Exit (followed by return)
And finally
Exit (you guessed it, return again!)
(The first Exit gets you out of SU, the second one closes Terminal Emulator)
That changes the sales code to US unlocked. Then reboot into recovery, do a factory reset, and when your phone boots it will probably show H for signal. After setup if it isn't LTE or LTE+ just toggle Airplane mode on and off and Voila! You should be now able to get LTE/LTE+ !!!
Hopefully this can save people some headaches and provide faster internet to the masses!
(I had max download speed on speed test 103mbps)
If you need the carrier apps like visual voicemail, Verizon or other carrier app, check PLAY STORE, or try the method below:
Originally Posted by*BlueFox721*
"Some T-Mobile users were able to use carrier functions straight out of the gate with unlocked firmware. Others had to flash carrier CSC and others needed csc and USERDATA files...some were able to use just shortcut master lite to enable features..."
Thanks out to :good: BlueFox721, :good: PartCyborg and the rest of you awesome people that make this community great!
OptimuSlime said:
LTE+ The Easy Way!
I've been pulling out my hair trying to get LTE+ and root at the same time. I was doing something differently two days ago and couldn't figure out what it was. And then BAM! :laugh:
If you follow the BlueFox721 Carrier Switch Guide and go with unlocked firmware, let's say Att or Tmobile, you at a certain point "Echo" in the sales code for that company... like ATT or TMB. I changed mine to TMB for UNLOCKED Tmobile, but TMB is ALSO the code for LOCKED Tmobile. Basically when I would reset for SamFail, (Nearly identical to PwnFail but for Note 8) the system was seeing a US based phone, asking for a TMB setup, so I got LOCKED TMB 4GLTE
All I had to do after rooting to achieve LTE+ was:
Go through the phone setup process
Install Terminal Emulator, run TE, type SU for Super User (You have to grant it Su access, and if the SU command works the $ symbol in TE will become a #)
Then type the following:
echo "XAA" > /efs/imei/mps_code.dat
Then press return!
And then type
Exit (followed by return)
And finally
Exit (you guessed it, return again!)
(The first Exit gets you out of SU, the second one closes Terminal Emulator)
That changes the sales code to US unlocked. Then reboot into recovery, do a factory reset, and when your phone boots it will probably show H for signal. After setup if it isn't LTE or LTE+ just toggle Airplane mode on and off and Voila! You should be now able to get LTE/LTE+ !!!
Hopefully this can save people some headaches and provide faster internet to the masses!
(I had max download speed on speed test 103mbps)
If you need the carrier apps like visual voicemail, Verizon or other carrier app, check PLAY STORE, or try the method below:
Originally Posted by*BlueFox721*
"Some T-Mobile users were able to use carrier functions straight out of the gate with unlocked firmware. Others had to flash carrier CSC and others needed csc and USERDATA files...some were able to use just shortcut master lite to enable features..."
Thanks out to :good: BlueFox721, :good: PartCyborg and the rest of you awesome people that make this community great!
Click to expand...
Click to collapse
Worked for me lol
Been trying to change it for a week now and kept changing back to orig
Hi my s8 is already unlocked one and our country has 4g+. Will it work?
Depends.
tosunkaya said:
Hi my s8 is already unlocked one and our country has 4g+. Will it work?
Click to expand...
Click to collapse
The "Carrier Aggregation" has to be enabled in your area by the phone carrier. If it is then I believe it will, but this just enables it on the phone, not in the towers
OptimuSlime said:
The "Carrier Aggregation" has to be enabled in your area by the phone carrier. If it is then I believe it will, but this just enables it on the phone, not in the towers
Click to expand...
Click to collapse
Is there different 4g+ sign on the top?
4.5g = 4g+ (lte plus) Vodafone app says; my phone, simcard and tower are compatible. Also using volte and vowifi. But i cant get 4g+ speed.
tosunkaya said:
Is there different 4g+ sign on the top?
4.5g = 4g+ (lte plus) Vodafone app says; my phone, simcard and tower are compatible. Also using volte and vowifi. But i cant get 4g+ speed.
Click to expand...
Click to collapse
Couldnt upload other Screenshot
Well
tosunkaya said:
Couldnt upload other Screenshot
Click to expand...
Click to collapse
On my phone I only connect to band 2 on TMB. When I boot as XAA I get 2 and 12, and the LTE gets a Plus. You can use *#0011* to see your bands. It'll show the LTE you are on, and below that the CA line will either say 0 0, needs configuring, or show the 2nd band of your CA.
I never use Wificalling and Google Duo is at least as good as tmobile video calling so U1 firmware is best for me.
OptimuSlime said:
On my phone I only connect to band 2 on TMB. When I boot as XAA I get 2 and 12, and the LTE gets a Plus. You can use *#0011* to see your bands. It'll show the LTE you are on, and below that the CA line will either say 0 0, needs configuring, or show the 2nd band of your CA.
I never use Wificalling and Google Duo is at least as good as tmobile video calling so U1 firmware is best for me.
Click to expand...
Click to collapse
My service mode
Do i need
TheMadScientist said:
Worked for me lol
Been trying to change it for a week now and kept changing back to orig
Click to expand...
Click to collapse
How did you do it? I'm always stuck on the screen where it says, "Restart your phone to configure the features supported by your new SIM card. This will reset your phone to its factory default settings, erasing all data, including files and downloaded apps."
DaNamesFrank said:
How did you do it? I'm always stuck on the screen where it says, "Restart your phone to configure the features supported by your new SIM card. This will reset your phone to its factory default settings, erasing all data, including files and downloaded apps."
Click to expand...
Click to collapse
Each diffrent sim i put in it does the restart and install the carrier apps Tried it on att cricket xfin straighttalk
So if I were to switch carriers rite now and install there sim all I have to do is reboot 2 times and I am ready to go
I can only connect to LTE after doing this no LTE+/4G/3G/2G
OptimuSlime said:
On my phone I only connect to band 2 on TMB. When I boot as XAA I get 2 and 12, and the LTE gets a Plus. You can use *#0011* to see your bands. It'll show the LTE you are on, and below that the CA line will either say 0 0, needs configuring, or show the 2nd band of your CA.
I never use Wificalling and Google Duo is at least as good as tmobile video calling so U1 firmware is best for me.
Click to expand...
Click to collapse
Will it just work on U if you enable band 12 in service mode?
So this is a hack so to speak
as of right now Crcket does not have a bit 7 firmware but thats ok screw them.
So download any Us multi csc firmware you need for what ever bit number your on.
Flash that in latest odin.
Insert your cricket sim,It will reboot to personalize the device for the new carrier I just did this on bit 7 and am running cricket csc on bit 7 despite not even being released...
Next you must put your sim in any cricket wifi calling enabled device. Setup wifi calling on that device. Put in your address and such...
Then replace your sim back into the samsung device and you are good to go
As you can see from my screen shots my device is originally a cct Xfinity Mobile but running aio latest Jan security patches with operational wifi calling
Found out the guy lied. So the US unlocked N20U does work with VZW wifi calling.
It definitely does work with my N20U on Verizon.
The only differences between the Unlocked and VZW version are:
1. Native Verizon video calling doesn't work on unlocked, but the integrated Duo video calling is better anyways.
2. Verizon's model doesn't have the Samsung "Smart Call" feature for Caller ID. Instead, it uses Verizon's app.
3. Verizon's version has the Verizon bootscreen and a ton of bloatware, especially games, news apps, and what not. Fortunately, most can be uninstalled, and the rest can be disabled using ADB.
Guyinlaca said:
The only differences between the Unlocked and VZW version are:
1. Native Verizon video calling doesn't work on unlocked, but the integrated Duo video calling is better anyways.
2. Verizon's model doesn't have the Samsung "Smart Call" feature for Caller ID. Instead, it uses Verizon's app.
3. Verizon's version has the Verizon bootscreen and a ton of bloatware, especially games, news apps, and what not. Fortunately, most can be uninstalled, and the rest can be disabled using ADB.
Click to expand...
Click to collapse
I can confirm all of the above. I have an unlocked phone, on U1 firmware, with a Verizon SIM. Wifi calling works. There is no "Advanced Calling" menu in Connection Settings, but there's a toggle for VoLTE and it was switched on by default. No 4G icon, but rather a LTE+ icon is shown in status bar. The only thing I haven't found a workaround for is the native video calling. I cannot initiate it (phone app does not show the option when I'm on a call with another Verizon phone) and if another Verizon phone attempts to initiate a native video call, it tells them that I cannot accept video calls. I checked my VZW account settings on a PC, and despite the video call option being on and not blocked, native calling doesn't work, as described above. Duo works fine for video. I was able to get Visual Voicemail by installing the app that I go from another thread. I installed it before checking to see if the U1 firmware added it by default, so I can't say for sure that it wasn't there already.
Sent from my SM-N986U using Tapatalk
So I had an interesting observation. I flashed my Verizon Note 10+ to U1 firmware and noticed a drastic reduction in data speeds. After getting the Note 20 Ultra, I noticed the data speeds were nearly doubled. I then disabled a ton of Verizon and Samsung apps, and my data speeds dropped drastically as well. Through the process of elimination, I found that the "My Verizon Services" app seems to have a major impact on data speeds. As long as I keep that enabled on the Verizon firmware, data speeds are blazing fast.
Is it possible that Verizon uses apps to prioritize or de-prioritize data speeds? I'd be curious if one could do a side by side of the Unlocked vs Verizon firmware.
ferzmedina said:
I can confirm all of the above. I have an unlocked phone, on U1 firmware, with a Verizon SIM. Wifi calling works. There is no "Advanced Calling" menu in Connection Settings, but there's a toggle for VoLTE and it was switched on by default. No 4G icon, but rather a LTE+ icon is shown in status bar. The only thing I haven't found a workaround for is the native video calling. I cannot initiate it (phone app does not show the option when I'm on a call with another Verizon phone) and if another Verizon phone attempts to initiate a native video call, it tells them that I cannot accept video calls. I checked my VZW account settings on a PC, and despite the video call option being on and not blocked, native calling doesn't work, as described above. Duo works fine for video. I was able to get Visual Voicemail by installing the app that I go from another thread. I installed it before checking to see if the U1 firmware added it by default, so I can't say for sure that it wasn't there already.
Sent from my SM-N986U using Tapatalk
Click to expand...
Click to collapse
Thanks for sharing your observations regarding wifi calling. How can one tell it is working? I am used to older phones advising that wifi calling was in use via text in the phone app. I'm not seeing this notification on my new unlocked T-Mobile-branded N20U with Verizon SIM.
I also noticed the VoLTE toggle in the phone app, switched on and greyed-out, can't be deselected. Of course they don't want to support anything but VoIP anymore. What is the behavior, if the cell signal is decent it won't use wifi? It can't be forced to prefer wifi, can it? I used the trick of putting it in airplane mode, then turn on wifi to try and force it to wifi call. It said it couldn't make the call in airplane mode, which is not encouraging regarding wifi calling being functional on this phone/provider combo.
[email protected] said:
Thanks for sharing your observations regarding wifi calling. How can one tell it is working? I am used to older phones advising that wifi calling was in use via text in the phone app. I'm not seeing this notification on my new unlocked T-Mobile-branded N20U with Verizon SIM.
I also noticed the VoLTE toggle in the phone app, switched on and greyed-out, can't be deselected. Of course they don't want to support anything but VoIP anymore. What is the behavior, if the cell signal is decent it won't use wifi? It can't be forced to prefer wifi, can it? I used the trick of putting it in airplane mode, then turn on wifi to try and force it to wifi call. It said it couldn't make the call in airplane mode, which is not encouraging regarding wifi calling being functional on this phone/provider combo.
Click to expand...
Click to collapse
From what I've found, if you put another carrier's SIM in a truly unlocked carrier branded phone, it should prompt you to apply your carrier settings upon boot. For example when I put a Spectrum SIM in a Verizon phone, it "converted" the CSC (Carrier settings and boot logo) to Spectrum.
My recommendation is to attempt to get the SIM to switch the CSC automatically. If not, use the patched ODIN to flash the Unlocked U1 firmware, and optionally you can flash Verizon from there if Verizon's Video Calling is a must.
Guyinlaca said:
From what I've found, if you put another carrier's SIM in a truly unlocked carrier branded phone, it should prompt you to apply your carrier settings upon boot. For example when I put a Spectrum SIM in a Verizon phone, it "converted" the CSC (Carrier settings and boot logo) to Spectrum.
My recommendation is to attempt to get the SIM to switch the CSC automatically. If not, use the patched ODIN to flash the Unlocked U1 firmware, and optionally you can flash Verizon from there if Verizon's Video Calling is a must.
Click to expand...
Click to collapse
Thanks for the detailed response. I was a little concerned about the T-Mobile branding, and what that truly meant at the software level. I installed the Verizon SIM to this factory-reset phone. If it was going to switch CSC I think it would have happened then. It went through the usual setup steps, but still displays T-Mobile screen at boot. I'm not sure what else I would do to "get the SIM to switch the CSC automatically".
Would you agree with my conclusion that wifi calling isn't working based on the outgoing call failure when in airplane mode with wifi on?
If there is better, more-unlocked firmware I'm not opposed to flashing it. It's been a while since I've played with rooting and custom ROMS, but I'm guessing stock firmware is a lower-risk activity on an expensive phone.
I'll refer to this link to try and flash to unlocked U1 firmware, hopefully that will allow wifi calling compatibility:
OTA and Non-OTA Firmware for N986U and N986U1
Forgive me if this has been covered but I havn't found the answer. I've flashed just about every phone I've ever had but my question here is can I / how do I flash to where the phone reads as XAA in download Mode?
The situation is my phone was originally on at&t. They unlocked it and I'm on Verizon. It all works great (it still says at&t on download Mode screen)
My problem is that if I log into the my Verizon app it disables my visual voicemail. I finally got a Verizon tech on the phone that explained that it is unsupported due to originally being on a different carrier and their system identifies that and disables the VVM. The only fix I can find is to put my sim in my backup S9+ that came from Samsung unlocked (or any Verizon phone) and I can then reactivate my VVM by resubscribing.
I currently have 3 Note 20 Ultras. One Each originally from Samsung, ATT and Verizon but the AT&T is the only one that is 512GB or I would just switch phones. I have flashed them all to U1 firmware but notice they all still reflect the original carrier in Download Mode so again my question is can I change this by flashing it / or is it just a matter of what sim card is in it when it's flashed? I need it to be seen as XAA by Verizon system so not to loose VVM... Pics attached.
Any advice here is greatly appreciated in advance.
Just a try... You can try the *#272*imei# method... But thats If it works. Not sure if the sims has to be in the phone for that to work.
GDHAMTON7 said:
Just a try... You can try the *#272*imei# method... But thats If it works. Not sure if the sims has to be in the phone for that to work.
Click to expand...
Click to collapse
Yes it brings up this menu... So I just select the XAA and that's it? I've been reading forums and this method is reversible it seems ... I'm familiar with Odin and all that but these hidden menus are new to me...
Thanks for the reply btw
You may have to activate the bottom most option to stay.
Don't worry if you can't access the menu after the change. You can download samsung band selection and change to automatic or one of the lte options then back to automatic to get to the menu.
CSC Guide
CSC (which I think means Carrier Service Code) helps to set what options for settings show in the device for things like voicemail and wifi calling, as well as sets network code information for things like carrier aggregation combos.
When you go to your phone settings->about phone->software information and look in the Service Provider SW ver. section, you will see as the last line a combo like XXX/YYY/ZZZ. This indicates what carrier sales and network code is set and what brand the phone was manufactured as.
I think of the XXX/YYY/ZZZ configuration as follows
XXX=Sales Code-What kind of features are setup in the firmware like wifi calling, video calling and settings menus
YYY=Network Code-What kind of network features are set for things like carrier aggregation and LTE/5G bands
ZZZ=Manufactured as Code- What model the phone was originally manufactured as. Ot has no affect on the system settings or options. THIS CAN NOT CHANGE. IT SHOULD ALWAYS BE THE SAME. ONLY A ROOTED PHONE WOULD BE ABLE TO ACCESS THE FILES NECESSARY TO CHANGE THIS.
for more details, refer to post:-
[Guide] Service Mode and CSC Guide/Enable LTE/5G Bands and Services/5G Low Band on U1
Hello All, Many people have asked about service mode and CSC related questions and I thought we should get a discussion going that is all in one place. *DISCLAIMER* I do not take any responsibility for any issues that may occur from changing...
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