VoLTE provider support

Incoming calls stay on 4G as you said. I’ll edit my former comment.

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Thanks but I am not sure where is the S12.1 config file or line, what to copy and where, so I will refrain myself from messing up my phone for the moment :grinning:

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Telia EE is S252.1 and this directory doesn’t exist in /vendor/oem/modem-config/

Does someone know the situation (VoLTE only Deadline) in Germany for Blau.de (E-Plus)?
I´m using a X Compact as daily driver, and a XA2 as spare, both with Sailfish and i wan´t to use is as long as possible.

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How about anything under /vendor/firmware_mnt/image/modem_pr/mcfg/configs that might match? Those modem.conf files need to reference a relative path under there.

In Germany all providers are stopping 3G support right now but no one is stopping 2G for the foreseeable future, so no VoLTE only deadline. BTW there is no E-Plus anymore, it should be o2-de already for years

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I might’ve found a match with mcfg_sw/generic/euro/emt/vl/est/mcfg_sw.mbn (Telia used to be EMT here originally, and this seems to be the only Estonian configuration available) but even after making a new S252.1/modem.conf with it and rebooting, VoLTE registration does not succeed yet.

I’d leave that running for a while, and maybe see if there’s anything you can request with your provider before abandoning it. Maybe it’ll suddenly start working tomorrow. Thanks for trying anyway though, I think we might get a few people having successes with this.

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Hi Abranson

I am on uk Ee.

I get S20.1

Appreciate you looking at this.


You are all right. I did a test call with loudspeaker, what i usually not do and spottet it switches from 4G to 2G for the call and back to 4G after it! I can live with it right now, thanks for your answer!

Here are config files for Czech Vodafone: https://github.com/sonyxperiadev/device-sony-common/pull/891 VoLTE is working now, thank you!


Fantastic that someone’s had some success! I made a topic for this with more explanation of the process. Have fun and don’t break your phones (or you can keep both halves)!


Yes GSM may stay online till… 2030? Don’t know for sure, but there are just to many GSM-based M2M products in the wild that it’s highly unlikely to be phased out much earlier if at all IMHO.
However, not having VoLTE available is still annoying since simultaneous data and voice connections are not possible in 2/2.5G (or, to be more precise, not supported by any provider in Germany).
Just my 2 cents.

I found AT&T’s USA VoLTE hardware whitelist on their website with all the phones, tablets, etc., that work on the network after the 2g/3g sunset earlier this year. Notably, it includes the Xperia 10 and Xperia 10 plus (with recent s/w update) but not the 10 II or 10 III. So I guess that when I tested out my 10 II with Android in Spring of 2021 before flashing SFOS, it must have been still falling back to 3g when I did the test call. I certainly didn’t think to test that at the time. :frowning:

Here’s the doc if anyone’s interested.

Since others have had success with the Xperia 10 II on T-Mo USA, and Big Magenta’s IMEI checker liked my 10 II, I’ve ordered a SIM from them and hopefully can report my findings – hopefully success – next week.

To extend this behavior: I don’t have 2G reception in my office (only 4G). It is eventually possible to receive calls in my office now, but trying to call someone fails, the phone does not even try 4G outbound calls if there is no 2G available. Calls started on 2G do also not switch to 4G when 2G reception fades, as it seems.
Is it possible (for testing) to enforce 4G VoLTE outbound calls through a terminal command?

Not having Mobile Data Connection while taking a mobile call isn´t that dramatic for me.

It was almost anoying for me since I’m using Waze for navigation and an android streaming app for audio pretty often, and these app requested a restart each time the dara connection broke. Plus you wouldn’t get updates in Waze (speedcams, traffic) if you were making calls while driving which could thus become very expensive either in time or money:-)

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In general i agree you that this should be fixed, even for the older Models. In the meantime i use offline Navigation with Here We Go or OSM-Scout.

Btw. good Navigation-Software should precache and load all static content when starting the trip.

I tried to activate VoLTE in Xperia 10 ii but failed. Country=Finland, Operator=Moi, Network=DNA. It appears DNA network supports VoLTE but Moi does not (just asked them). To me that is not really important because Signal and WhatsApp calls.

Spusu/Mass dont provide VoLTE, I called the company to ask about it.