Sprint Galaxy S8 - is phone and web at same time possible? - Sprint Samsung Galaxy S8 Questions & Answers

Does Rooting allow phone calls and web browsing at the same time on Sprint Galaxy S8 ? Is the phone capable of this. Does it have enough/the right radios?

No, current Sprint phones do not call and data simultaneously over 3G or LTE, including the S8. Rooting has nothing to do with it.

please explain
OK, you say rooting has nothing to do with it. How does an Samsung phone on Sprint prevent concurrent data and voice on LTE when Samsung phone on Verizon allows concurrent data and voice.
It has to be hardware or software on the phone or the network that prevents this.
Is the hardware inside the phone the same which suggests to me the phone's functionality is "throttled" by the phone software or by the network itself, hence my question about whether this can be overcome via rooting the phone.
You apparently can get free hotspot through root, why not call + data?? If you can't I'll accept the reality (I am not looking for alternative facts), just that your answer was insufficient to persuade me that my logic is wrong.
Thanks,
Paul S
[=LordLugard;72722221]No, current Sprint phones do not call and data simultaneously over 3G or LTE, including the S8. Rooting has nothing to do with it.[/QUOTE]

Sprint doesn't have voice over LTE ....yet. Apparently they are working on software solutions to whatever their network issues are. Found this post from about a month ago on the sprint community site.
Sprint is excited to announce a new solution which allows customers to use voice and data simultaneously while on the Sprint LTE network or WiFi. Calling PLUS has just been enabled on the Samsung J7 Perx, with more devices to receive the update soon!
What you need to know:
Calling PLUS combines two features: one old and one brand new!
WiFi calling - our VoIP calling feature that lets you make and receive calls over WiFi
Voice and text on the Sprint LTE network, allowing simultaneous voice and data
Calling PLUS is delivered to your device by software update. Once your device has received the software, set up is easy!
On the phone, select Settings > Calling PLUS.
Slide Calling PLUS to On.
Customer can view Tutorial pages to learn more information about the service.
View pre-populated address
If the Country field says Non-USA, Select the Country and choose USA.
Enter a USA address manually.
If address is not shown or is incorrect, enter the address manually.
Address must be within the USA.
Select Save.
Your phone will validate the address required for E911 service and completes the enablement of Calling PLUS.
Select Calling PLUS options to enable each feature:
Wi-Fi Calling is On by default.
LTE Calling is optional but recommended to allow both Simultaneous Voice and Data and call handoffs between Wi-Fi Calling and LTE Calling.
Call handoffs will go from Wi-Fi to LTE even if the LTE Calling switch is Off. LTE Calls require the Wi-Fi Calling switch to be turned On for a handoff to Wi-Fi.
That's it! Your phone is now enabled for Calling PLUS. You can call anyone using Calling PLUS, the person or party that you're calling does not need to have Calling PLUS in order for it to work.
Keep in mind:
Calling PLUS is included free of charge with your Sprint plan, though data usage does count toward any metered data allotment.
Calling PLUS is a only available to select devices at this time and only in areas with LTE service. We will add more device models over time.
Calling PLUS is not a VoLTE solution and call quality can vary based on location and network conditions.
Calling PLUS is only supported on the Sprint LTE network and will not work over roaming partner networks.
Calls initiated while on LTE will not hand off to CDMA towers. When leaving an LTE area, such a call may drop.
Have questions about Calling plus? Ask us here! Have you received the update on your device? Tell us how it's working for you so far.

Related

[Q] No secure connnection over T-mobile 3G or 2G Network

Hi, and thanks for reading. I'll be brief and clear as much as possible.
I am using:
Samsung Nexus S
Android OS 2.3.6 GRK39F
T-mobile US
My issue:
A secure connection (or https) cannot be established over 3G or 2G network.
it works fine over WiFi access.
Additional Info:
I used to have H2O wireless which uses AT&T's 2G Network, and I didn't have any problem like this.
Contacted T-mobile tech support and set APN settings as instructed, but still did not work.
This issue results in:
The phone cannot use Google services (Gmail, Market,etc.) native to the phone as well as apps that require authentication (facebook, twitter, etc.) over 3G or 2G network. In order to get around this, I have to connect to WIFI first to authenticate then it works fine over 3G or 2G.
Thank you again guys, and I am looking forward to getting your professional help.
T-mobile's new Monthly 4G plan may have a problem in their Data Network??
Actually, I found out that it's not my phone's problem, but it could be the problem of T-mobile network.
I've found a thread in t-mobile support page where a bunch of people complaining about the same problem.
They all bought t-mobile's Monthly 4G plan that just came out (Oct 16, 2011), which offers 100min talk, unlimited text, unlimited data (with 5GB throttling)
They are complaining that they cannot get https connection over 3G or 2G Data Network regardless of their cell phone.
I tried to post an outside link, but the forum does not allow me since I am new here.
This issue has been resolved.
The link in the prior reply now shows a solution to this issue.
Virtually, the "Web Guard" feature on the plan was causing the mess.
You can turn off the feature by yourself on tmobile website, or by calling their customer service.
They say it may take up to 2 hours for the action to fully take effect.

T-Mobile WiFi Calling in Lollipop

http://www.androidcentral.com/t-mobile-add-wi-fi-calling-support-its-nexus-6-model-early-2015
Shipping with Android 5.0, the new Nexus 6 gives customers the latest and greatest Google mobile experience, and seamless integration with the apps they love. Plus, this hot new smartphone is expected to support Wi-Fi Un-leashed beginning in early 2015 with an over-the-air update– making it the first-ever Nexus device that will support Wi-Fi Calling thanks to enhancements in Android 5.0. And only with the Un-carrier can customers use the latest, super-sized devices the way they were meant to be used – with no annual service contract, no domestic overages and unlimited music streaming all on the nation's fastest LTE network, plus unlimited data and texting in 120+ countries and destinations − and now, Wi-Fi Un-leashed.
Click to expand...
Click to collapse
Will this be exclusive to the Nexus 6? If it is, surely it will be possible to port it to the Nexus 5?
Here's to hoping we get this included in our 5.0 update.
my first thought, which is nothing more than a guess, is that this will be hardware based on the N6 and "unlocked" with a T-Mo OTA and will not be able to be ported to the N5.
Lucke said:
my first thought, which is nothing more than a guess, is that this will be hardware based on the N6 and "unlocked" with a T-Mo OTA and will not be able to be ported to the N5.
Click to expand...
Click to collapse
considering Tmobile is making this feature available in early 2015 with an OTA I think you are right in guess that this will be something Tmobile bakes into the OS and not functionality native in Android L
Edit: Unless Google has a planned update for L in early 2015 that Tmobile knows about (I highly doubt it)
Improved network handoffs resulting in limited interruption in connectivity. For example, continue your video chat or VoIP calls without interruption as you leave the house and switch from your home Wi-Fi back to cellular
thats from here https://www.android.com/versions/lollipop-5-0/
I think wifi calling and voLTE are going to be baked into 5.0 no matter the carrier
david279 said:
Improved network handoffs resulting in limited interruption in connectivity. For example, continue your video chat or VoIP calls without interruption as you leave the house and switch from your home Wi-Fi back to cellular
thats from here https://www.android.com/versions/lollipop-5-0/
I think wifi calling and voLTE are going to be baked into 5.0 no matter the carrier
Click to expand...
Click to collapse
that's my suspicion as well..
google may bake hangouts code (or the hangouts dialer code) into the native dialer, making them one & the same -
http://forums.androidcentral.com/google-nexus-5/436152-nexus-5-likely-see-wi-fi-calling-over-t-mobile-soon-4.html#post3918556
david279 said:
Improved network handoffs resulting in limited interruption in connectivity. For example, continue your video chat or VoIP calls without interruption as you leave the house and switch from your home Wi-Fi back to cellular
thats from here https://www.android.com/versions/lollipop-5-0/
I think wifi calling and voLTE are going to be baked into 5.0 no matter the carrier
Click to expand...
Click to collapse
but that doesn't necessarily mean that t-mobiles wi-fi calling feature, or VoLTE compatibility is baked into 5.0. VoLTE is too new to test fully, and while that may work, you can't use VoLTE on wi-fi. the features you're talking about is the issue of dropping signal for that split second when you leave your house (the time where wi-fi drops off and cell doesn't re-establish itself instantly) for the purpose of hangouts (voice or video).
i still think that since the N5 isn't compatible with t-mo's wi-fi calling, it's not just a software thing.
that is talking about network handoff in general, nothing about hangouts. And the ota to enable this feature will be released next year so its probably being tweaked now to be ready for next year.
---------- Post added at 03:02 PM ---------- Previous post was at 02:58 PM ----------
also wifi calling has never been a hardware feature, its all software. back in the day of early CM(7 or 8) wifi calling was added to all the T-mo htc phones and it was the same as its being done today. A apps and a couple of libs in /system.
in other words, the feature doesn't need a carrier add -on (ims core registration), if it's OS software based..
even right now, we *have it* on the nexus 5, with gv / hangouts / number integration, on wifi & lte & I can stream a youtube vid & be on a call at the same time, so right now, it's a given in the userspace via apps, as an over the top solution (works dam well too)
a revision of android L may deeply provide a seemless solution with it's update; I suspect this much.. (the carrier's ims' Ok on data voice is only complementary) but, can be worked around..
j'vai said:
even right now, we *have it* on the nexus 5, with gv / hangouts / number integration, on wifi & lte & I can stream a youtube vid & be on a call at the same time, so right now, it's a given in the userspace via apps, as an over the top solution (works dam well too)
Click to expand...
Click to collapse
its not the same thing. you go from cell signal call to a wifi call with the same number. it is not VoIP.
Zepius said:
its not the same thing. you go from cell signal call to a wifi call with the same number. it is not VoIP.
Click to expand...
Click to collapse
even currently, hand-offs isn't reliable, votle / wifi calling is more, stationary than anything, from what I've been reading from the experiences of users on tmobile & Verizon..
with the over the top solution now on the nexus 5 (or many adroid devices), same difference;
one better, technically the nexus 5 isn't even supported on Verizon, but yet, can have voice over lte on Verizon (AWS) with a lte data only connection ..
on other networks, it matters not what the data air interface is, the call can be made, with one solution..
j'vai said:
even currently, hand-offs isn't reliable, votle / wifi calling is more, stationary than anything, from what I've been reading from the experiences of users on tmobile & Verizon..
Click to expand...
Click to collapse
this is impossible. Verizon does not have wifi calling at this time.
you cannot compare VoLTE to tmobile's WIFI calling as they are not the same.
VoLTE is only VoIP over LTE. nothing more.
tmobile's wifi calling is a regular cell signal call that can become a VoIP call but still use the original tmobile number.
Zepius said:
this is impossible. Verizon does not have wifi calling at this time.
you cannot compare VoLTE to tmobile's WIFI calling as they are not the same.
VoLTE is only VoIP over LTE. nothing more.
tmobile's wifi calling is a regular cell signal call that can become a VoIP call but still use the original tmobile number.
Click to expand...
Click to collapse
look at what you've typed, & go back & re-read what you quoted from me...
......
"Keyan X
3 hours ago
The nexus 5 can access and use Verizon LTE its been proven and confirmed"
"iavaj jj
3 hours ago (edited)
+Keyan X I'm not disagreeing with you that it DOESN'T work; just expanding that, from my prior post, one can have unfettered data & voice on Verizon's LTE band 4, where coverage is..
Google gave the nexus 5 a backdoor with the new hangouts dialer.."
---------- Post added at 09:12 PM ---------- Previous post was at 09:08 PM ----------
Zepius said:
this is impossible. Verizon does not have wifi calling at this time.
you cannot compare VoLTE to tmobile's WIFI calling as they are not the same.
VoLTE is only VoIP over LTE. nothing more.
tmobile's wifi calling is a regular cell signal call that can become a VoIP call but still use the original tmobile number.
Click to expand...
Click to collapse
"on other networks, it matters not what the data air interface is, the call can be made, with one solution.. "
I'm on sprint, with gv integration, all I'd need is data -
http://forums.androidcentral.com/google-nexus-5/436152-nexus-5-likely-see-wi-fi-calling-over-t-mobile-soon-5.html
anywhere in the world, I'd have the same 202 (wash dc) area code calling out..
j'vai said:
even currently, hand-offs isn't reliable, votle / wifi calling is more, stationary than anything, from what I've been reading from the experiences of users on tmobile & Verizon..
with the over the top solution now on the nexus 5 (or many adroid devices), same difference;
one better, technically the nexus 5 isn't even supported on Verizon, but yet, can have voice over lte on Verizon (AWS) with a lte data only connection ..
on other networks, it matters not what the data air interface is, the call can be made, with one solution..
Click to expand...
Click to collapse
nexus 5 does not work on voice over lte(volte) that verizon has. yes, verizons volte just began. no, the nexus 5 does not work on it. only thing that the n5 can do on verizon is get data.
simms22 said:
nexus 5 does not work on voice over lte(volte) that verizon has.
Click to expand...
Click to collapse
if it can ALREADY obtain the lte data service ( as in the youtube video) what would hinder gv from making & receiving calls with an over the top solution, with just Verizon acting as a dumb pipe?
it hasn't stopped me on sprint, nor tmobile, I guess it wouldn't stop me on att..
what would stop it on Verizon?
j'vai said:
look at what you've typed, & go back & re-read what you quoted from me...
......
"Keyan X
3 hours ago
The nexus 5 can access and use Verizon LTE its been proven and confirmed"
"iavaj jj
3 hours ago (edited)
+Keyan X I'm not disagreeing with you that it DOESN'T work; just expanding that, from my prior post, one can have unfettered data & voice on Verizon's LTE band 4, where coverage is..
Google gave the nexus 5 a backdoor with the new hangouts dialer.."
---------- Post added at 09:12 PM ---------- Previous post was at 09:08 PM ----------
"on other networks, it matters not what the data air interface is, the call can be made, with one solution.. "
I'm on sprint, with gv integration, all I'd need is data -
http://forums.androidcentral.com/google-nexus-5/436152-nexus-5-likely-see-wi-fi-calling-over-t-mobile-soon-5.html
anywhere in the world, I'd have the same 202 (wash dc) area code calling out..
Click to expand...
Click to collapse
you still do not understand the difference between VoIP, VoLTE, and wifi callling
I guess the majority are stuck on the schematics of volte, as only being ims based implemented by the carrier, also wifi calling or it ain't real -
"VoLTE, Voice over LTE is an IMS-based specification. Adopting this approach, it enables the system to be integrated with the suite of applications that will become available on LTE."
http://www.radio-electronics.com/info/cellulartelecomms/lte-long-term-evolution/voice-over-lte-volte.php
I'm not swayed by market speak, when the solution is at hand already, market speak sways many to purchases not needed, wen what they had in hand already could have done the job perfectly..
j'vai said:
if it can ALREADY obtain the lte data service ( as in the youtube video) what would hinder gv from making & receiving calls with an over the top solution, with just Verizon acting as a dumb pipe?
it hasn't stopped me on sprint, nor tmobile, I guess it wouldn't stop me on att..
what would stop it on Verizon?
Click to expand...
Click to collapse
thats fine, use your google voice number on the data only connection. you said that voice calls work over volte. when in fact they do not. older lte tech did not allow voice calls over lte, so when you made calls, you switched to H or 3G. this new tech allows calls over lte now, which needs a device that can call over lte. the nexus 5 can not call over lte, but most new phones will be able to now.
Zepius said:
you still do not understand the difference between VoIP, VoLTE, and wifi callling
Click to expand...
Click to collapse
market speak aside the division of wifi, lte, voip calling, is calls over data - which I expressed my sentiment here (posted for the second time)-
http://forums.androidcentral.com/google-nexus-5/436152-nexus-5-likely-see-wi-fi-calling-over-t-mobile-soon-5.html#post3929214
guess I need to copy & paste w/o the pics -
"have a hacker mindset, & push things to work how you want them;
forget simply wifi calling, I want it all, *data calling* irrelevant of the air interface used;
I have a truphone sim, that was collecting dust in my wallet for the longest, last night I decided to try something,
*use it*, lol
it had like $39 odd on it in credit, as stated, I'm a current sprint sub, with google voice integration, I've gave the truphone number to no one, it's basically dormant, minus test calls to keep the account alive, but it's no contact number for me..
what I'm did last night was swap my sprint sim, for the truphone sim, to utilize it's data, while still having my main sprint number via google voice, which I can receive & make, calls, videochat, mms, sms via hangouts, I've set hangouts to *receive incoming calls* since the native dialer isn't tied to the sprint sim anymore (so no double rings from hangouts & the native dialer)...
I want to see how far that $39 will take me..
at home & at work, I'm connect to wifi, so only in between, out & about am I utilizing truphone AKA tmobile's hspa data service-
all calls via the hangouts / gv / sprint number are nothing but data calls, ither on tmobile's hspa or wifi, likewise with sms, mms, & of course video chat.."
I won't have to upgrade from the nexus 5, for the same feature set..
j'vai said:
market speak aside the division of wifi, lte, voip calling, is calls over data - which I expressed my sentiment here (posted for the second time)-
[SNIP]
I won't have to upgrade from the nexus 5, for the same feature set..
Click to expand...
Click to collapse
congrats. you discovered VoIP.
VoIP is not the same as VoLTE
VoIP is not the same as WIFI calling.
i'm correcting you because you are spreading mis-information.
simms22 said:
thats fine, use your google voice number on the data only connection. you said that voice calls work over volte. when in fact they do not. older lte tech did not allow voice calls over lte, so when you made calls, you switched to H or 3G. this new tech allows calls over lte now, which needs a device that can call over lte. the nexus 5 can not call over lte, but most new phones will be able to now.
Click to expand...
Click to collapse
*my voice calls over lte with google voice on the nexus 5 works wOnders*
& I can use the browser, stream from youtube while on a call.. I don't have to wait for the carriers to *OK* the phone from their IMS core.. I simply go over the top of it, for the same functionality..

How do you activate wi-fi calling?

Does anyone know how to activate wi-fi calling on the Z5? I figured it'd be a menu setting, but I can't find it. I'm using the Taiwan version of the Compact and am using MetroPCS here in the States.
Thanks.
To answer my own question. It appears that wi-fi calling is only available with some carrier phones. So for instance, EE in England says on their setup page,
"WiFi Calling is only available on the EE version of the Sony Xperia Z5 Compact, bought directly from us in one of our stores, online at EE.co.uk, through our telesales team, or through corporate sales if you are a corporate customer."
So, I guess my question now is, is there a way to flash the phone so that I can get this feature on my non-EE phone? My carrier, MetroPCS, does allow wi-fi calling, but they don't sell the Z5 (and likely won't ever sell it).
You can try flashing the EE ROM with flashtool and see if you have that option. You will get carrier specific bloatware as well.
Would I be able to delete the bloatware? And I'm new to Android. When I flash, does it delete all of my settings and downloads and whatnot? I'm assuming I can back them up someplace in case it does, but like I say, I'm new to this. Also, where would I get the EE Rom from?
Look for Xperifirm. Download and install. You can get the firmware there. Next download flashtool version 0.9.19.10. You can bundle the firmware files into a ftf and flash, both with flashtool. Read the respective guides. To keep data, look at options when flashing and choose not to wipe user data. I would type it up but the instructions are on XDA, just search.
Neither WiFi calling or VoLTE will not work on the Sony Z5 unless your carrier/network offers the Sony Z5 for sale directly.
Note, WiFi Calling and VoLTE are two separate features but similar network functions on the operators side.
Note, MetroPCS is a sub-brand of the T-Mobile USA network so Metro is pretty much TMo USA.
Since T-Mobile USA does not offer the Z5 you will not be able to get WiFi calling working. In order for WiFi Calling or VoLTE to be supported the network operator must customize the ROM to include the WiFi calling and/or VoLTE network configurations. Unlike the typical SIM card and APN settings which are industry standard and can be adjusted manually. WiFi calling and VoLTE are somewhat more complex and include carrier/network specific security certificates to work. Apple can get away with supporting WiFi calling and VoLTE simply by swapping SIMs because the T-Mobile configs are loaded into their core iOS software which goes out to everyone around the world. (Probaly one of the reasons the iOS eats up so much storage...but i digress) Android runs much leaner and does not carry all the extra configs for all global networks...hence a carrier (i.e. T-Mo US) tweaked version of the Z5 ROM would be required for this all to work.
If T-Mobile USA offers the Z5 in the future you may be able to unlock the boot-loader and flash the T-Mobile specific ROM onto your phone and get WiFi Calling and VoLTE to work. But if T-Mo USA never offers the Z5 then you will never have WiFi calling supported.
Hope that helps....
WiFi calling and VoLTE are pretty much the same thing...just VoIP. And in most operators case WiFi Calling and VoLTE are the same back end network call processing systems. VoLTE is easier for the operator to secure as the customer is using the operators LTE and IP network. WiFi calling is seen on fewer operators as it requires more security since you can access the operators network from any public or private IP network.
---------- Post added at 10:28 PM ---------- Previous post was at 10:20 PM ----------
and in theory you could extract the WiFi calling stack form the EE network's Z5 ROM and load it into a custom ROM. That would give you the software capability to support WiFi calling....But you will still need the T-Mobile USA WiFi calling fqdn for the WiFi border controller and their security certificates which are typically specific to a handset model. And again since TMo does not offer the Z5 there are no Z5 certificates.
Ah, well that sucks.
Yeah I feel ya, I love WiFi calling too
Some network providers have their own apps to allow it. Like in the UK, O2 network has an app called TU go
All hope isn't lost - Android M is supposed to have a provision for wifi calling. I've read posts of people with Nexus 6's on M (google play editions, so no carrier specific models) that have been able to use wifi calling. The current loss of band 12 (hoping this will change too) as well as the loss of wifi calling as a fallback has been the only drawback to this otherwise excellent handset. I absolutely love the thing. It just works, no fuss.
I know this isn't helpful, especially for those outside of the US, but this is why I ported my number to google voice a long time ago. VOIP works great over Wifi for me most of the time and when I have LTE reception, I can still use Voip albeit with increased data consumption.
shizenyasuya said:
I know this isn't helpful, especially for those outside of the US, but this is why I ported my number to google voice a long time ago. VOIP works great over Wifi for me most of the time and when I have LTE reception, I can still use Voip albeit with increased data consumption.
Click to expand...
Click to collapse
Do you know of any guides for how this is supposed to work? I have Google Voice, and I have Hangouts, but I'm not sure how they're supposed to work in tandem for wi-fi calling. Would I be forced to actually open up the Google Voice app in order to make wi-fi calls? How is that any different from something like Talkatone?
Adrift98 said:
Do you know of any guides for how this is supposed to work? I have Google Voice, and I have Hangouts, but I'm not sure how they're supposed to work in tandem for wi-fi calling. Would I be forced to actually open up the Google Voice app in order to make wi-fi calls? How is that any different from something like Talkatone?
Click to expand...
Click to collapse
Yeah, that's a bit of a pain in the ar$3. I install google voice and hangouts on any phone/tablet I get, Google voice is necessary to route all outgoing calls through GV so that my GV number shows up on my call partner's caller ID. (even though you can dial directly from the native phone dialer) I install Hangouts to manage sms and google talk (now just google hangouts but specified to avoid... or contribute to, (as the case may be) confusion) messages. You can also dial directly from Google Hangouts (this is the only option when you're only using Wifi, without cellular signal) So my thought flow kinda goes like this.
To make a call:
1)check for cell signal, if there is signal, use the native dialer to place a call
2) if there is only WiFi, use hangouts (or hangouts dialer) to place a call
Receiving calls: (If you need help I can tell you the specific settings)
1)when the phone rings, determine if it's ringing via Hangouts or the native phone app
2) check for cellular signal and wifi signal
3) if cell signal is 2g only, only answer with the native phone app (sometimes hangouts will ring first) and I have to wait for the native phone app to realize there is a call coming in (forwarded of course to my cellular provider number from GV)
4)if connected to WiFi, or I have LTE coverage (sometimes even on 3g) pick up the hangouts ring.
Sometimes I do miss calls because I'm waiting for the native phone app to ring when I'm on 2g, but hangouts rings first and the native phone app doesn't ring, but those instances are fairly infrequent and I can just call them back.
---------- Post added at 04:51 AM ---------- Previous post was at 04:48 AM ----------
Adrift98 said:
Do you know of any guides for how this is supposed to work? I have Google Voice, and I have Hangouts, but I'm not sure how they're supposed to work in tandem for wi-fi calling. Would I be forced to actually open up the Google Voice app in order to make wi-fi calls? How is that any different from something like Talkatone?
Click to expand...
Click to collapse
Also, sorry I've never used Talkatone, so I don't know if it works any differently. You don't have to have google voice installed to make / receive wifi calls via hangouts. you just have to have opted in to hangouts on your google voice account. The ONLY reason I still install GV is to make sure that when I make outgoing calls from the native phone app, my GV number shows up on the recipient's caller ID. They should really just bake this into hangouts and completely depreciate the GV app.
You could port the t-mobile wifi calling apps from the z3. I ported wifi calling to my att g2 from the t-mobile rom. It's not really that hard if you know how to read logcats
Many retail mobiles have "Wifi Calling" function but not any menu entry to enable , The APP can check the hidden function and enable it if can use.
https://play.google.com/store/apps/details?id=com.widget7.wifi.calling

How can VoLTE be used to much benefit?

VoLTE seems to me to be much ado about very little. I know what the technology does, but I also read from the wireless providers the limitations such as:
- Both ends must use VoLTE. Many phones have it off by default.
- It only works with another phone on the same wireless provider's network. What are the chances of that?
- If the phone is not a carrier's branded phone, you do not get VoLTE or VoWi-Fi.
- It cannot be used with landline connections.
- Even if the call does go VoLTE/HD Voice, you will be billed for the same number of calls or minutes.
- If you force VoLTE by enabling VoWi-Fi, and be able to make and receive domestic calls for free while abroad, any international local calls or data will be billed at the very expensive international roaming rates.
- If you use a local SIM while International, you will get inexpensive local calls, but unable to use VoLTE to send or receive calls from home for free.
VoLTE seems Mickey Mouse when you have apps like Signal where you get secure chat, secure calling, and secure video conferencing, without being charged by the text, being charged by the call or by the minute, with the only dependency is a data connection.

Textnow Has FREE Cellular service starting 1-28-2020

The free calling and texting app Textnow which formerly only worked on Wifi or with a paid subscription is now offering Free cellular service through the Sprint network. You just pay once for a $9.99 SIM activation kit and never need to pay a monthly fee or anything again. The Free part is only Voice and text. Their voice and texting does use mobile data but mobile data can't be used for anything else like surfing the Internet unless you pay extra. It does of course have ads to pay for this service but I haven't found them any problem. You have your own phone number and it automatically will switch between available Wifi and cellular for calls and texting. Great idea in my opinion for an extra phone number or backup phone or even a primary phone if you are in a good Sprint network area. Your phone must be compatible with Sprint's network (CDMA) or you can buy refurbished phones from Textnow that are all set to go.
Textnow now has a GSM SIM that works through T-Mobile. It took a bit of digging to find info needed to make the SIM work but so far I can only make outgoing calls and texts when on cellular (VoLTE) with
Wifi turned OFF. I can't receive calls or texts unless Wifi is ON. Is anyone else trying their new GSM SIM and had this problem? This is free cellular! You just have to put up with some ads. Textnow states you can make and receive calls on cellular but so far can't get the incoming working.
If you have trouble with this new GSM SIM even connecting here is the solution I found to at least make outgoing calls work: Go into settings > Wifi and Internet > SIM and network settings > SIM (T-Mobile) > Access Point Names > Add APN. Getting there may vary some by phone and OS version but you need to add the APN - Name : TextNow APN: textnow.static - then just save it and after saving choose it as the APN in the little circle. Turn on Airplane mode for about 10 seconds and then turn back off and you should see VoLTE and be able to make calls. If you can receive calls and text also please post here with anything you did to accomplish that.

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