Develop Bugs

T-Mobile and H815 HD Voice/WiFi calling?

Hi everyone! I've decided that the G4 is the right phone for me. After using the G3 for 8 months and bouncing back between the Huawei Ascend Mate 7 and the Nexus 6 for the past few months, I've come to the conclusion that 5.5" screen size is perfect for my use and hand size - but I have a few questions before biting the bullet and ordering one.
I'll be switching over to T-Mobile for use here in the states from AT&T. Since I travel quite a bit to Europe, the H815 will cover the frequencies/bands I need to connect to data networks over there. My question is this - will the H815 version that's available to pre order support things like HD voice and WiFi calling? Or is this something that T-Mobile has to implement on to their phones and as a result, I must purchase their version of the phone? The HD voice isn't as important as the WiFi calling, I feel as if that is something worth purchasing the T-Mobile version for.
Cheers!

I believe you need the T-mo version for wifi calling. That's something they integrate into their version of the OS.
Sent from my LG-H811 using XDA Free mobile app

Wrightperspective is correct. The H815 has no native Wifi calling ability.

Wrightperspective said:
I believe you need the T-mo version for wifi calling. That's something they integrate into their version of the OS.
Sent from my LG-H811 using XDA Free mobile app
Click to expand...
Click to collapse
I see you're using the H811 model - that's the T-Mobile specific version, no?
And since I'll need the T-Mobile version, I now need to consider the LTE bands/frequencies of the T-Mobile version to ensure I'll have data whenever I travel to Europe.
Edit: I suppose some more food for thought could go towards ROM's and what not. Is it fair to assume that the H815 model will receive more support from devs since it's the international version and what not? I honestly think I'm okay with no WiFi calling if it means getting an unlocked bootloader quicker/more ROM support from the lovely XDA community.

AhsanU said:
I see you're using the H811 model - that's the T-Mobile specific version, no?
And since I'll need the T-Mobile version, I now need to consider the LTE bands/frequencies of the T-Mobile version to ensure I'll have data whenever I travel to Europe.
Edit: I suppose some more food for thought could go towards ROM's and what not. Is it fair to assume that the H815 model will receive more support from devs since it's the international version and what not? I honestly think I'm okay with no WiFi calling if it means getting an unlocked bootloader quicker/more ROM support from the lovely XDA community.
Click to expand...
Click to collapse
It is always hard to predict what model will get dev support before it happens. Sometimes a phone with a world version will still get more support on one of the individual carrier versions. As for the frequencies, I did a brief compare based on the published information for the 810, 811, 815 over here http://forum.xda-developers.com/showpost.php?p=60992462&postcount=30

Does Unlocked HTC 10 support: VoLTE, Band 12 and WiFi Calling on T-Mobile?

HTC has T-Mobile variant on their website, but I wanted to purchase an unlocked HTC 10 instead and need a confirmation if it will support T-Mobile's features. Main things are: Band 12 and VoLTE, but if it also has WiFi Calling, then even better.

Unlocked devices usually don't support services such as Voice over LTE (VoLTE), Wi-Fi Calling, Mobile Hotspot and LTE Carrier Aggregation. Does the HTC 10 Unlocked edition support those services?
Yes, unlike other mobile phone manufacturers, HTC is proud to offer the best user experience to our customers. We support Voice Services over LTE (VoLTE), Wi-Fi Calling, Mobile Hotspot and Carrier Aggregation. Check with your service provider for details. Our HTC 10 has been built from the ground up for the North America customers and wireless networks. Some services may require the feature to be supported by your mobile operator before it will function on the HTC 10.
Click to expand...
Click to collapse
HTC 10 Unlocked Band Support
LTE Bands FDD 2,3,4,5,7,12,13,17,29; 2G GSM/GPRS/EDGE - 850/900/1800/1900; 3G UMTS - 850/AWS/900/1900/2100; LTE - FDD - B28/B12/B13/B17/B29/B20/B5/B4/B3/B2/B1/B30/B7.
Click to expand...
Click to collapse
Source: http://www.htc.com/us/go/htc-10-unlocked/

i have an international unlocked and was able to see tmobile band 12 when i was in area that supported it. at the time, i had loaded the US unlocked rom on it.

I purchased the unlocked version and am able to use Wi-Fi calling on T-mobile. The signal is really great too, even indoors!

It is good to know! Thank you all! Do you guys have any feedback about the device? I did read reviews and watched videos, but they usually don't cover much. Are there any issues that HTC hasn't addressed yet and that potential buyer should know about?

Having purchased mine a month ago, I love the phone. Compared to the m9 I had, this phone is amazing. Battery life is surprisingly great, runs quick, takes great pictures, and I have not had a single issue with it. Wi-Fi calling with T-Mo works well. You'll love it.

Buying Unlocked HTC one M9 - Future T-mobile Issues?

My family has a contract with T-Mobile, and I am looking at buying a factory unlocked version of it that has not been activated on any network.
I have heard about wi-fi calling not working unless I flash a T-mobile stock rom to it; is this simply referring to the roms on the htc support website or is it about something else?
Will 4g lte work? I checked and it seems that it uses the same bands as the T-mobile but are there other factors in this?
Will there be any other potential issues I should check for?
I am not phone-savvy so any and all help will be incredibly appreciated!

I have the developer edition M9 on T-Mobile (USA) and can confirm that there are no reception issues (full 4G/LTE compatibility). You are correct about wifi calling - this is baked into the T-Mobile ROM. If you achieve S-OFF and change the CID & MID, you can install that and have wifi calling too. There are guides aplenty and we're happy to help you if you go that route.
T-Mobile is pretty great with getting software updates out in a timely manner, but they have not yet released Android 7 (Nougat). It is coming though, so I don't see any downside whatsoever to having the unlocked M9 on their network.

[Q] Best way to get a phone that will work with Verizon and all LTE bands overseas

I've really enjoyed my S7 and want to upgrade to the S9. Later in the year I'll be overseas for almost a year, so I want something that will work with all Verizon bands of LTE, but also not have a firmware lock that would cause it to not work on other bands of LTE overseas. (planning to just use prepaid dataplan sim cards overseas)
I think my two options are to either get a US 'unlocked' version or wait for the 'international' version. My understanding is the primary differences between the unlocked and international version is the 2G/3G coverage for CDMA and possibly slightly different hardware. I'd rather have a phone with CDMA backwards capability, but my prime concern lacking full access to all LTE bands available wherever I am.
I'm not really interested in going any route that would require me to root the phone if there is a way to do it without.

Well the only way to get VZW compatibility is the VZW phone or a US unlocked model. So you're looking at the US Unlocked model at this point.

A listing of all the different model numbers available (per country and carrier) is available here: https://www.techwalls.com/samsung-galaxy-s9-sm-g960-g965-model-number-differences/
You will probably want to get the phone that works with your primary location the most. I am not sure which countries use which frequencies for LTE in Europe; you will need to research that to see what you may be missing out on.
With my T-Mobile S7, I haven't had any issues when traveling in Europe or Asia. It connects to LTE usually.

So I just did a deep dive of that list:
It looks like the Verizon and Unlocked versions are almost identical (the unlocked US version has B46(5200) 4G TDD LTE, but I'm not sure anyone who uses it)
Looking at 4G FDD LTE it looks like a Verizon or US unlocked phone will have almost complete coverage around the world, notable gaps are B30(2300) in China/Canada/US AT&T, B32(1500) in UK and B71(600) (US Tmobile). I thought that was a bit confusing as you'd expect a US Unlocked phone to service all LTE bands available in the US yet it lacks AT&T and Tmobile bands.
So based on all that information looks like I should just get an unlocked US phone to be totally safe, and I'd likely also be fine getting a Verizon version also.

StykerB said:
Well the only way to get VZW compatibility is the VZW phone or a US unlocked model. So you're looking at the US Unlocked model at this point.
Click to expand...
Click to collapse
Relcan said:
So I just did a deep dive of that list:
It looks like the Verizon and Unlocked versions are almost identical (the unlocked US version has B46(5200) 4G TDD LTE, but I'm not sure anyone who uses it)
Looking at 4G FDD LTE it looks like a Verizon or US unlocked phone will have almost complete coverage around the world, notable gaps are B30(2300) in China/Canada/US AT&T, B32(1500) in UK and B71(600) (US Tmobile). I thought that was a bit confusing as you'd expect a US Unlocked phone to service all LTE bands available in the US yet it lacks AT&T and Tmobile bands.
So based on all that information looks like I should just get an unlocked US phone to be totally safe, and I'd likely also be fine getting a Verizon version also.
Click to expand...
Click to collapse
So I'm new to Android but i use Verizon prepaid. Will I lose anything by going with the unlocked version or should i stick with a Verizon S9?
I don't use video calling. All i do is text and talk but I've heard that people on Verizon prepaid have issues with unlocked Android phones.
Thanks

Would Wifi Calling work with the US unlocked on verizon? I thought that required a Verizon FW to be flashed. I imagine all the other features such as voLTE / HD calling, etc to work on the US unlocked.

testinguser said:
Would Wifi Calling work with the US unlocked on verizon? I thought that required a Verizon FW to be flashed. I imagine all the other features such as voLTE / HD calling, etc to work on the US unlocked.
Click to expand...
Click to collapse
Curious about that also

testinguser said:
Would Wifi Calling work with the US unlocked on verizon? I thought that required a Verizon FW to be flashed. I imagine all the other features such as voLTE / HD calling, etc to work on the US unlocked.
Click to expand...
Click to collapse
Throwinrocks said:
Curious about that also
Click to expand...
Click to collapse
I did a cursory review of the wifi-calling FAQ on their website. They don't mention anything about compatibility with Unlocked versions of phones (that I saw). I'd call tech support to ask, but I'd expect there to be a 50% chance of getting the wrong answer from the tech based on my interactions with their support.
There might be some good experience based anecdotes in the Galaxy S8 forum, if it works on an unlocked S8 its a safe bet it will work on an unlocked S9
I think I'll ask in the Verizon subreddit, it seems like they normally have really good information as well.
I'm mostly curious about the LTE TDD Band 46 (5200) - its the only band an unlocked US phone has that a Verizon phone doesn't. 5200 is in the U-NII frequency range, no cellphone service providers use it, but I wonder if it may be used for local LTE networks in the near future. The other advantage is avoiding all the verizon bloat wear, but that may be what allows the Wifi Calling to work!

All this has me thinking I might have to add the extra $80 and just buy the Verizon version. I don't get phones on contract and I've always just paid full price. (Page 2 404 error?)

Apparently the Nov/Dec Samsung s8 firmware update added an option for BYOD carrier provisioning for unlocked s8. Given the similarity, I'd imagine the same to be true for s9. Can someone who has an unlocked s8 confirm?

Well after a little more research I see that if you use Verizon prepaid you lose visual voicemail and WiFi calling even if you use a Verizon phone so there's no need in me paying extra for a Verizon S9. Unlocked it is.

Throwinrocks said:
Well after a little more research I see that if you use Verizon prepaid you lose visual voicemail and WiFi calling even if you use a Verizon phone so there's no need in me paying extra for a Verizon S9. Unlocked it is.
Click to expand...
Click to collapse
You might wanna check this as Verizon is starting to implement network locks on some devices as to deter thefts more
Dont know when or what devices but it was a statement Verizon made

So, you're saying the prepaid SIM might not work in an unlocked S9?
I don't think Verizon is keeping Verizon prepaid SIMS from working in unlocked phones they are just locking their phones like Sprint and AT&T still do.
I had no problems with my unlocked Pixel 2 XL that I purchased from Google and my Verizon prepaid, just no visual voicemail.

Verizon version

The unlocked version of this phone doesn't seem to be compatible with Verizon's 5g mmwave and many features like wifi calling, hd audio, and hd video calling are not available on the unlocked 5G like the original Razr that was a Verizon exclusive. Any help is appreciated. This is highly frustrating. Just don't know why these features can't at least be enabled while just using 4G LTE.

Wifi calling is unsupported by verizon on their end, mmwave is unsupported because afaik verizon is the only one that tried pushing for it. As far as hd audio I'm assuming you're talking about VoLTE which mine does perfectly fine on Verizon, you may have to call verizon and have them switch your line to LTE only as that's how my line is set up due using oneplus devices. As for video calling I'm really not sure how any of it works, I thought it gets routed through duo?