Develop Bugs

T-Mobile - Band 12 and VOLTE

So I see that the OnePlus 3 is listed as supporting Band 12 LTE and it looks like the OnePlus 2 did as well (this would be my first OP device). From what I saw though, the OP2 did not support VOLTE on T-Mobile at launch. How did Band 12 support work then, since I believe T-Mobile requires devices to support VOLTE to use Band 12? And does the OP3 support both?

Yes it does support both
Sent from my HTC 10 using Tapatalk

raptir said:
So I see that the OnePlus 3 is listed as supporting Band 12 LTE and it looks like the OnePlus 2 did as well (this would be my first OP device). From what I saw though, the OP2 did not support VOLTE on T-Mobile at launch. How did Band 12 support work then, since I believe T-Mobile requires devices to support VOLTE to use Band 12? And does the OP3 support both?
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Since the Oneplus 3 is an unlocked phone and T-Mobile is one of several carriers that uses Band 12, they can't force Oneplus to disable/remove Band 12 from the phone, so Band 12 will be supported.
Additionally, per the recent AMA thread from Oneplus, the phone is capable of voLTE.
However, what T-Mobile CAN (and almost certainly will) do is prevent the Oneplus Three from being registered as a supported voLTE device on their network until Oneplus completes their costly/time-consuming voLTE certification.
What this basically means is that until OnePlus jumps through T-Mobile's certification hoops, we'll be able to use Band 12 for data, but as soon as we make/receive a call, we'll be kicked down to H or H+ (assuming we have the coverage).

Smudgeous said:
Since the Oneplus 3 is an unlocked phone and T-Mobile is one of several carriers that uses Band 12, they can't force Oneplus to disable/remove Band 12 from the phone, so Band 12 will be supported.
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While I understand that they can't force it, the US models of the Nexus 5x and Moto X Pure launched with Band 12 disabled and only received it in a later update.

raptir said:
While I understand that they can't force it, the US models of the Nexus 5x and Moto X Pure launched with Band 12 disabled and only received it in a later update.
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The Oneplus 2 was reported to have worked on Band 12 the way I previously mentioned more than a month before the Nexus 5X's release date, and Oneplus still lists Band 12 support for the North American Oneplus 3 on their website.
T-Mobile was also happy to sell you the T-Mobile version of the 5X which was certified for band 12.
Additionally, Band 12 is not as much of a T-Mobile monopoly as it was last year. AT&T just started transitioning to Band 12 last fall, announcing in their status update report to the FCC early last October “many of our devices have been sold with Band 12 filters and can be upgraded via software to support Band 12. We will begin the process of transitioning to Band 12 late in 2015 and / or early 2016.”
All things considered, it would make no sense for Oneplus to disable Band 12 this year.

Does htc 10 support TTA VOLTE CODE?

I want to use VOLTE in korea, So I have to know my htc 10(unlocked ver) support TTA VOLTE CODE.
Does HTC 10 support TTA VOLTE??
TTA VOLTE is code which makes VOLTE available.

Help this company said:
I want to use VOLTE in korea, So I have to know my htc 10(unlocked ver) support TTA VOLTE CODE.
Does HTC 10 support TTA VOLTE??
TTA VOLTE is code which makes VOLTE available.
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You need your firmware and your carrier to support it. Unlocked model of HTC 10 supports VoLTE. If your carrier does then you are good to go.

xunholyx said:
You need your firmware and your carrier to support it. Unlocked model of HTC 10 supports VoLTE. If your carrier does then you are good to go.
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I already know unlocked htc 10 support after nougat. But I searched , To use VoLTE in korea I need some code(or type) in firmware.
My carrier (Sk telecom) doesn't support international VoLTE code(type). They use their code not international code.(I don't know exactly).
International VoLTE include all VoLTE types? If yes, then I can use VoLTE.!

Help this company said:
I already know unlocked htc 10 support after nougat. But I searched , To use VoLTE in korea I need some code(or type) in firmware.
My carrier (Sk telecom) doesn't support international VoLTE code(type). They use their code not international code.(I don't know exactly).
International VoLTE include all VoLTE types? If yes, then I can use VoLTE.!
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If your carrier doesn't support VoLTE, then you won't be able to get it. I'm on Telus in Canada with a US Unlocked device. US Unlocked supports VoLTE, but my carrier only supports it for the newer iPhone models. So I don't get it and you won't either, unless I/you change carriers or our carriers decide to support it. Sorry, but that's the way it is.
EDIT: I misread your post. And don't understand it to tell the truth. VoLTE should either be supported or not. If they don't use International/WWE code (?) then try US Unlocked firmware instead.

Help this company said:
I already know unlocked htc 10 support after nougat. But I searched , To use VoLTE in korea I need some code(or type) in firmware.
My carrier (Sk telecom) doesn't support international VoLTE code(type). They use their code not international code.(I don't know exactly).
International VoLTE include all VoLTE types? If yes, then I can use VoLTE.!
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As someone who lives currently in Korea and understands this issue on a very real level (lolㅠㅠ),
most carriers in the world use a VoLTE standard defined by the 3GPP. What Google claims regarding baking VoLTE into Marshmallow is according to the 3GPP standard. This is why I can buy a phone in Spain and take it to Germany and use it no problem (for the most part).
But Korean carriers established their own VoLTE standard called TTA-VoLTE before 3GPP could create an international standard. So any phones bought in Korea likely won't work with VoLTE abroad, and vice-versa (save for some exceptions).
In terms of carrier, the key exception is LG U+; since their network depends exclusively on LTE and CDMA, for BYOD customers (해외구매폰) they have to support the 3GPP standard on top of the TTA-VoLTE standard (see link below). There are some success stories of people taking their Hong Kong phones and using it on LG U+, their LatAm Samsung phones, etc.
In terms of phones, iPhones and some Google phones, some Sony phones (flashed with Korean ROMs), and some LG phones supposedly support TTA-VoLTE (check 2nd link).
My advice? If you have the phone with you, either take it to LG U+, see if they can register the phone as "OM-Phone" (Open Model), and see if VoLTE works; or just live without VoLTE as I have been doing for the past 2 years (ㅠㅠ).
Source: https://www.clien.net/service/board/lecture/8311065? (Korean only)
Source: https://namu.wiki/w/VoLTE#s-7

Which foreign carriers (USA) are supported in Z2 plus? Pls. share experiences

I am going on a trip to the USA, and would like to know which SIM to purchase there. Do you have experience about which bands are supported or which SIM brands offer compatible SIMs for Lenovo Z2 plus?
Also, I'm running AICP Nougat based ROM. Will changing to newer ROM give my any band benefits?

badarsh2 said:
I am going on a trip to the USA, and would like to know which SIM to purchase there. Do you have experience about which bands are supported or which SIM brands offer compatible SIMs for Lenovo Z2 plus?
Also, I'm running AICP Nougat based ROM. Will changing to newer ROM give my any band benefits?
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Hi Badarsh2, on lighter note, are you visiting Las Vegas?
Regards,

badarsh2 said:
I am going on a trip to the USA, and would like to know which SIM to purchase there. Do you have experience about which bands are supported or which SIM brands offer compatible SIMs for Lenovo Z2 plus?
Also, I'm running AICP Nougat based ROM. Will changing to newer ROM give my any band benefits?
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More than ROM, network is dependent on baseband. Stock ZUI 3.5.x based on Oreo has higher baseband version compare to stock ZUI 2.5 (Indian) based on Nougat !!
Secondly, best is to tweet to respective career of US to ask them along with your phone link to see if they support your device.
Check GSM Arena, or back of phone box, it lists the different frequencies the phone support. Then use the Google or Career website to figure out if they provide services on those supporting frequencies or bands !!
Thanks.

badarsh2 said:
I am going on a trip to the USA, and would like to know which SIM to purchase there. Do you have experience about which bands are supported or which SIM brands offer compatible SIMs for Lenovo Z2 plus?
Also, I'm running AICP Nougat based ROM. Will changing to newer ROM give my any band benefits?
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Click to collapse
You should buy any sim that uses AT&T services. On T-Mobile you won't have 3G/3G+, although LTE is good. But during a call, your phone would automatically switch to 2G, and since 2G is being phased out, you will have bad reception and dropped calls.

Does VoWifi work on OP5T?

Recently, jio and airtel announced VoWifi in India. I am sure many other carries must be offering this already globally.
Does op5t support VoWifi?

Yes, OnePlus 5T supports VoWiFi (WiFi Calling).

how to enable it and when it will be officially available in india

is there a workaround for att in the US? My Galaxy s8+ had wificalling and so did my galaxy s5 but for some reason they don't let me enable it on my 5t

LineageOS for Samsung Galaxy S10e Snapdragon exists?

LineageOS exists a version for Samsung Galaxy S10e with Exynos processor, but not for Snapdragon, is there a way to install it on Snapdragon?

Isakman said:
LineageOS exists a version for Samsung Galaxy S10e with Exynos processor, but not for Snapdragon, is there a way to install it on Snapdragon?
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In short, yes.
See here for unofficial Lineage build. Limitation is no IMS (volte) though.
I'm considering buying a G970U (US version) with 8GB RAM and paying for bootloader unlock code, see here.
Perhaps best option is to continue work of OP in that thread and build your own with security updates.

ParkourPaul said:
In short, yes.
See here for unofficial Lineage build. Limitation is no IMS (volte) though.
I'm considering buying a G970U (US version) with 8GB RAM and paying for bootloader unlock code, see here.
Perhaps best option is to continue work of OP in that thread and build your own with security updates.
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Can you tell me what the holdup is with the no IMS / VoLTE development on Snapdragon models, and when this is expected to change if at all, and what forum I need to follow to track this status? I live in the US and I just acquired a S10e G9700U1 thinking I could put LineageOS 18 or 19 on the phone and have VoLTE work. From what I've read, all of the carriers are pretty much mandating VoLTE as a matter of policy for the sake of 4G system management. Ever since the carriers dumped 3G I've been forced to resort to T-Mobile which has an awful footprint in order to keep running LineageOS with my S9 Dual Sim unit as Red Pocket refused to activate Verizon after AT&T shut down 3G and gave me the boot.

andyhoy said:
Can you tell me what the holdup is with the no IMS / VoLTE development on Snapdragon models, and when this is expected to change if at all, and what forum I need to follow to track this status? I live in the US and I just acquired a S10e G9700U1 thinking I could put LineageOS 18 or 19 on the phone and have VoLTE work. From what I've read, all of the carriers are pretty much mandating VoLTE as a matter of policy for the sake of 4G system management. Ever since the carriers dumped 3G I've been forced to resort to T-Mobile which has an awful footprint in order to keep running LineageOS with my S9 Dual Sim unit as Red Pocket refused to activate Verizon after AT&T shut down 3G and gave me the boot.
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I have no idea what the issues are with this though I've seen it with multiple devices so I assume the code stack for IMS services is custom to each device/ROM and come with their own idiosyncrasies/bugs to work out.
Perhaps shout up @klabit87 or other devs in the relevant forums for pointers.
I was extremely lucky and managed to get a free xperia 1 iv as it was refunded/cancelled but still delivered so I'm no longer pursuing a S10e solution.
EDIT: To add to this, the 'holdup' as you put, mostly comes down to the US snapdragon model not having official bootloader unlock support therefor there are very few devs, if any, working on it. The international version uses exynos chipset, the bootloader of which is unlock supported. This is why all the ROMs are exynos only.

ParkourPaul said:
I have no idea what the issues are with this though I've seen it with multiple devices so I assume the code stack for IMS services is custom to each device/ROM and come with their own idiosyncrasies/bugs to work out.
Perhaps shout up @klabit87 or other devs in the relevant forums for pointers.
I was extremely lucky and managed to get a free xperia 1 iv as it was refunded/cancelled but still delivered so I'm no longer pursuing a S10e solution.
EDIT: To add to this, the 'holdup' as you put, mostly comes down to the US snapdragon model not having official bootloader unlock support therefor there are very few devs, if any, working on it. The international version uses exynos chipset, the bootloader of which is unlock supported. This is why all the ROMs are exynos only.
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Thanks for the insight. From what I've read this is probably between Samsung and Qualcom where Qualcom charges Samsung for VoLTE/IMS licensing and subsequently Samsung can't or won't share the content, and it sounds like it's a lot of effort to reverse engineer. I have a Samsung S9 Duos which is international and running LOS 17.1, but I can only set it up with T-Mobile, and possibly not using VoLTE as it only says on my mobile carrier menu LTE and not VoLTE. From what I read Verizon and AT&T are forcing everyone to use VoLTE and won't let phones without it on their networks. So this makes Samsung custom ROMs in the US mostly useless.
I was considering trying to get a Exynos for the S10e as I love the formfactor and the 256GB memory, but if I wanted a Duos Exynos I'd have to pay 4 or 5 times what my US S10e version cost me, and then I'd probably be in the same boat as I was before with my S9. I'm shifting to a Pixel 5a or possibly a Moto G7 power as those are both reported to work on VoLTE, at least that's what I've heard.