1. Nogitsune Micah's Avatar
    I am strongly considering my return back tmobile. However there is absolutely no point in doing so if the 950s don't have wifi calling. I heard wifi calking was being supported in windows 10 but then at the same time tmobile isn't carrying it so idk what to think/do at the moment.

    Im currently using an unlocked 640 xl with att go phone
    11-07-2015 10:23 AM
  2. PepperdotNet's Avatar
    If wifi calling is a "standard" and supported in Windows 10, it should work on any carrier who implements that standard.
    RumoredNow likes this.
    11-07-2015 10:40 AM
  3. RumoredNow's Avatar
    any carrier who implements
    That's the operative phrase. Carrier Implementation. Baked in is fine, but the Carrier needs to support it still.

    T-Mo has shown favoritism to their branded phones with WiFi calling in the past. The exact phone as a branded one, but factory unlocked, was barred from downloading their proprietary WiFi calling App in the past. I'm not sure how they will treat a baked in solution from Microsoft. Like Apple? C'mon ahead! Or the way they have always done. Even the Nexus series only gets WiFi calling on T-Mo with a branded ROM.
    libra89 likes this.
    11-07-2015 11:27 AM
  4. PepperdotNet's Avatar
    Indeed, that's why I said "standard" - if it's a non-standard proprietary thing, then no way.
    11-07-2015 11:49 AM
  5. TechFreak1's Avatar
    Both devices support VoLTE and VoWiFI according the FAQs.
    11-07-2015 11:51 AM
  6. HoosierDaddy's Avatar
    Indeed, that's why I said "standard" - if it's a non-standard proprietary thing, then no way.
    But that's all there is, proprietary. WiFi calling is a form of VoIP and requires infrastructure by a carrier. The client portions could be a standard but I haven't heard if there is one. And even if there is, the carrier can choose to withhold it for some customers.
    Last edited by HoosierDaddy; 11-07-2015 at 01:00 PM.
    RumoredNow likes this.
    11-07-2015 12:48 PM
  7. tai4de2's Avatar
    The exact phone as a branded one, but factory unlocked, was barred from downloading their proprietary WiFi calling App in the past.
    That is not why wi-fi calling didn't work on non-Tmo WP phones. The app is just one small part of the total picture technically. I get that it's the most visible part, but even if you could have downloaded it, you would not have had functional wi-fi calling.
    11-07-2015 08:22 PM
  8. RumoredNow's Avatar
    So what was different between an ATT or an International 925 and a T-Mo 925?

    Honestly curious.
    libra89 likes this.
    11-07-2015 10:19 PM
  9. TechFreak1's Avatar
    So what was different between an ATT or an International 925 and a T-Mo 925?

    Honestly curious.
    That is a good question, If I was to hazard a guess T-Mo ROMs have unique identifiers or signatures embedded for authentication plus the tie into the dialler and SMS app. So when you said call / sms over WiFi they are amalgamated into one place, but that is just a guess.

    I'm curious if anyone has tried to force deploy the xap or side load it?

    Whereas in the UK and I imagine most places they use the identifier in the sim. As that would explain why we can download and have access to the O2 store for example on a unlocked and unbranded phone. Plus sending SMS or calling over Wi Fi using the carriers apps does not tie into the Dialler and SMS since the history resides in the app only.

    So for instance you had hard reset your phone - history lost; never the less I have never been a fan of this as you still pay the standard rate or have calls / texts deducted from your allowance even if you use your own Wi Fi {broadband internet connection}.
    RumoredNow likes this.
    11-08-2015 04:36 PM
  10. realwarder's Avatar
    I thought I read here that someone said that the latest Windows Mobile 10 release now supported Wi-Fi calling on T-Mobile. I guess that could be some left overs from the 8.1 upgrade or a T-Mobile special supported build, but I thought most builds of WM10 were pretty vanilla, which might imply the base OS can now support this via VoWiFi.
    11-08-2015 08:19 PM
  11. TexasLabRat's Avatar
    I thought I read here that someone said that the latest Windows Mobile 10 release now supported Wi-Fi calling on T-Mobile. I guess that could be some left overs from the 8.1 upgrade or a T-Mobile special supported build, but I thought most builds of WM10 were pretty vanilla, which might imply the base OS can now support this via VoWiFi.
    It's possible that if wifi calling is enabled in windows 10 mobile, it might still be dependent on the underlying firmware. I have an unlocked, unbranded 830 with latest preview release with a T-mobile SIM and I don't have an option to set up wifi calling that I can see. However, if I were to do the same thing with, say, a t-mobile branded 640 perhaps it would be there?
    11-08-2015 09:18 PM
  12. HoosierDaddy's Avatar
    However, if I were to do the same thing with, say, a t-mobile branded 640 perhaps it would be there?
    It's there but it's messed up. If you set it to WiFi calling only, it turns Airplane Mode on!
    TexasLabRat likes this.
    11-08-2015 10:38 PM
  13. taymur's Avatar
    is wifi calling different than skype calling, messenger calling, or WhatsApp calling?
    11-09-2015 01:37 AM
  14. HoosierDaddy's Avatar
    is wifi calling different than skype calling, messenger calling, or WhatsApp calling?
    WeFi calling is for when you have no carrier bars but have WiFi and want to talk to someone. I wouldn't be surprised if some or all those others aren't the same in that respect.
    libra89 likes this.
    11-09-2015 07:37 AM
  15. taymur's Avatar
    WeFi calling is for when you have no carrier bars but have WiFi and want to talk to someone. I wouldn't be surprised if some or all those others aren't the same in that respect.
    So basically VOIP, then why is everyone craving for it :S it seems like a normal thing to me. all phones have VOIP, one way or another.

    unless the other end doesn't have to have internet. then it makes things more interesting. although also Skype can do that, nut not all VOIP apps can.
    11-10-2015 05:39 AM
  16. HoosierDaddy's Avatar
    So basically VOIP, then why is everyone craving for it :S it seems like a normal thing to me. all phones have VOIP, one way or another.

    unless the other end doesn't have to have internet. then it makes things more interesting. although also Skype can do that, nut not all VOIP apps can.
    I don't know about now, but a few years ago developers were saying WP didn't allow them to write VOIP apps. Something to do with not being able to respond to things while in the background.

    And WiFi calling does NOT require the other party to have internet. It comes to them like any phone call.
    taymur, libra89 and RumoredNow like this.
    11-10-2015 07:17 AM
  17. Adam Frix's Avatar
    I have wifi calling on my 635 that I got from T-Mobile.

    Yes, things have been dicey in the past in this regard. Not buying from T-Mo generally meant you didn't get the feature.

    That's beginning to change, but it's still prudent to triple check on this. For example, the Blackberry Priv just came out--and T-Mobile announced that the unlocked version will in fact support Band 12, VoLTE, and wifi calling. I expect the same to be true of the 950 family, but I won't put my money down until and unless that's verified.

    For those wondering, wifi calling means switching back and forth from cellular to wifi and using the same voice infrastructure across the two. It's completely different than Skype or Google Hangouts.
    libra89 likes this.
    11-10-2015 01:47 PM
  18. TexasLabRat's Avatar
    So basically VOIP, then why is everyone craving for it :S it seems like a normal thing to me. all phones have VOIP, one way or another.

    unless the other end doesn't have to have internet. then it makes things more interesting. although also Skype can do that, nut not all VOIP apps can.
    The WiFi calling is native call services (voice, SMS, MMS etc) over wifi..so it's more than your typical VoIP app. Your phone works just as it would over the cellular radio except it just happens to actually use the wifi connection as the carrier. There's a lot of sekrit-soss stuff going on under the hood with IP encapsulation and integration into the cell network for call handoff to "real" cell towers that makes it non-trivial to implement without specific firmware hooks being present.
    Adam Frix and RumoredNow like this.
    11-10-2015 05:53 PM
  19. taymur's Avatar
    The WiFi calling is native call services (voice, SMS, MMS etc) over wifi..so it's more than your typical VoIP app. Your phone works just as it would over the cellular radio except it just happens to actually use the wifi connection as the carrier. There's a lot of sekrit-soss stuff going on under the hood with IP encapsulation and integration into the cell network for call handoff to "real" cell towers that makes it non-trivial to implement without specific firmware hooks being present.
    Who cares, functionally, it is the same as any other VOIP service. just one baked under the hood, rather than a separate app. which is also almost there by skype.
    11-11-2015 07:31 AM
  20. ericloewe's Avatar
    Who cares, functionally, it is the same as any other VOIP service. just one baked under the hood, rather than a separate app. which is also almost there by skype.
    You have clearly missed the point so eloquently made by the other posters.
    Last edited by RumoredNow; 11-11-2015 at 11:41 AM.
    11-11-2015 07:38 AM
  21. HoosierDaddy's Avatar
    Who cares, functionally, it is the same as any other VOIP service. just one baked under the hood, rather than a separate app. which is also almost there by skype.
    If by "who cares" you mean its absence won't keep a savvy user from communicating, you are right. But people who just know how to place and receive regular calls care.
    RumoredNow likes this.
    11-11-2015 08:20 AM
  22. Adam Frix's Avatar
    Who cares, functionally, it is the same as any other VOIP service. just one baked under the hood, rather than a separate app. which is also almost there by skype.
    nope. Not at all. Go back and read. It's not a simple app traveling over a simple IP connection. It's far, far more involved than that. Functionally, it's 100% different than any other VoIP service because it allows the user to use the same voice interface across cellular and wifi, invisibly. The user just chooses a contact and makes a call as normal; all the secret sauce under the hood manages which route it takes and how to transition from wifi to cellular networks. And is supports incoming calls as well, using the exact same infrastructure.

    All of this uses your assigned phone number. Others calling you don't have to jump through hoops or use a secondary Skype or whatever number "because I know he's at work and can't get cell service" or some such craziness.
    TexasLabRat likes this.
    11-11-2015 01:25 PM
  23. Adam Frix's Avatar
    If by "who cares" you mean its absence won't keep a savvy user from communicating, you are right. But people who just know how to place and receive regular calls care.
    Shoot, I'm a savvy user--and you know what? I just don't WANT to jump through a bunch of hoops, or make people calling me jump through hoops, just to hold a voice conversation. I'm old enough and I've earned that right.

    Over the last two years I've spent quite a bit of time visiting family in the hospital. The hospital has free wifi, but as you can imagine it does not allow much if any T-Mobile cellular service through. And not once did I care, because T-Mobile wifi calling just took care of it without my having to think about it ***as I visited family in the hospital***.

    For example: My wife had knee replacement surgery, then a year later had that revised (thanks, Zimmer, I can't wait for your check for THAT screwup), then a few months later had the second knee done...and for each of those instances, I had to wait for status update calls from the staff. That's right, the medical industry DOES NOT use email. Phone calls is it. The hospital is the LAST place I want to be fiddling with things just to be able to make a call--and certainly I couldn't ask them to fiddle around just to call me. T-Mobile wifi calling to the rescue. It. Just. Works.

    And yesterday T-Mobile upped the ante with double the data (I'll be up to 18GB of high speed data at that point, with talk and text the price will remain at $75) AND Netflix streaming not counting against my data. Add everything up and it's an attractive package.

    Wifi calling is a strong driver for me. Back on topic: I'm closely watching the Blackberry Priv, and I even took a look at one today at the AT&T store. It's nice. Is it $700 nice? Well, as a Lumia 635 user I'm anxiously awaiting the 950 family--the XL in particular--because I like Windows Phone 8.1 and I fully expect to like Windows 10 Mobile and the 950XL hardware. BUT: if they've screwed up and if putting a T-Mobile SIM into it does NOT give me full-on T-Mobiile wifi calling and VoLTE over band 12 (and mobile hotspot), like the Blackberry does, I will dismiss the 950XL as not useful to me and I will go buy the Blackberry at $700.

    Because I have standards and requirements for my phone that go well beyond a pretty face.

    I really, really want the 950 family to succeed. Here's a reason I don't want the Blackberry and Android: Google Now can't figure out my name. Seriously. On my wife's Galaxy S4, brand new from Cricket, if I ask it "OK Google, call (my dad's name)" it simply gets confused. Cortana on Windows Phone 8.1, on the other hand, immediately recognizes my family name and happily dials my wife, my father, my brothers, whatever. So Cortana is better than Google Now in a way that's important to me. I fully expect the Windows 10 version to be even better. But only time will tell.
    11-11-2015 01:39 PM
  24. moneyaggarwal14's Avatar
    The only information about that, as far as I know, is on the specifications page where it lists "WiFi Call" as a feature. Since it is so vague, it is uncertain if it will work on T-Mobile's network.
    11-13-2015 02:09 AM
  25. hmmm's Avatar
    WiFi calling is built into Android 6.0 now so the Nexus 5X and 6P can do WiFi calling on T-mobile even though there isn't a specific T-mobile ROM anymore and I would assume any 6.0+ phone will be able to as well in the future. Hopefully Microsoft follows and builds it into Windows 10 in the same way Google and Apple have done..
    Alex Zapata likes this.
    11-29-2015 12:04 AM

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