@robthebold Good way to test for VolTE, thank you. I just don't understand why the OPO with UBPorts isn't keeping the 2g/3g/4g settings because as you said LTE should work on it for data (and is working on a galaxy s5 and the pinephone). The APN preset is correct in the settings app.

@emphrath er, what's UTTT?

@emphrath battery seems to last about a day for me too as I'm also on stable. Axolotl is crashing for me though and does not send messages. How did you download & install it? I got it from the Open Store

@moem https://www.t-mobile.com/support/coverage/t-mobile-network-evolution it seems only those using Sprint sim cards are currently effected (I'm using a t-mobile sim. Was working on a galaxy s5 in Jan 2022 which had no VoLTE)

"What does the Sprint 3G (CDMA) network retirement mean to me?

On March 31, 2022, Sprint’s older 3G (CDMA) network will be retired. If you are still using a device that is dependent on Sprint’s 3G (CDMA) network or that does not support VoLTE, you’ll need to upgrade to a more modern device no later than the end of 2021 to continue getting service, including the ability to make 911 calls depending on your location"

In any case, 3G is working on the OPO with UBPorts, so I don't see why LTE wouldn't work from the carrier's perspective

4G LTE seems it should work on this phone:
https://productz.com/en/oneplus-one/p/XeYl8
https://www.phonearena.com/news/Cheat-sheet-which-4G-LTE-bands-do-AT-T-Verizon-T-Mobile-and-Sprint-use-in-the-USA_id77933

I have T-mobile and am only finding 2g and 3g works.

@moem VoLTE is not a requirement to use T-mobile's 4g anywhere yet from what I gather. I was previously using a 4G LTE phone with no connectivity issues (calls, web, mms)

I guess I should specify - how can I get UBports to work with t-mobile's 4g on the Oneplus One?

The hardware itself can connect to T-mobile's 4g bands according to:
https://productz.com/en/oneplus-one/p/XeYl8
https://www.phonearena.com/news/Cheat-sheet-which-4G-LTE-bands-do-AT-T-Verizon-T-Mobile-and-Sprint-use-in-the-USA_id77933

@mongoose https://www.t-mobile.com/support/coverage/t-mobile-network-evolution

It seems they will discontinue 3g service this year, so 4g will be essential for web browsing on this phone

does the oneplus one support 4g via t-mobile (USA)?
I can't save APN settings via the settings app and the 2g/3g/4g option won't stay selected.