Does it work nowadays?
How was coverage in the US with the C2? What region?
I only tested the C2 in my hotel room, 4G (because my plan doesn’t allow 5G). Little Italy, San Diego, CA. The 10 IV was my daily in San Diego, and I even drove a bit around with a car to the north and such, up to Dana Point.
Well US Mobile wanted me to update my plan anyway so I had them send me a darkstar sim. In a Librem 5 it gets volte registered ok and works as well as a Librem 5 can…
But not as much luck in the xperia 10 II. Data is fine and sms works but the volte selector in sfos cellular network page just blinks forever. Never denied, just blinking. To sanity check I tried a voice call and got the familiar tri-tone no service sound. I had been using t-mo and the us mobile t-mo sims before, and I’d made the modem config changes you’d divined back in '22.
Did you need to do any modem config sorcery to get att and darkstar to work on xoeria 10 ii?
I’d be really stoked to use attt network on the xperia, which unlike t-mo is available in my basement!
not even mobile didi work or normal calling
Did you reboot as sometimes that is needed after crossing the borders? At least it was.
Did you check that your operator indeed support Telemach?
In Xperia 10 V
| Country | Provider | Connection Icon | Registered | Registration | Sms Capable | Voice Capable |
|---|---|---|---|---|---|---|
| ES | Yoigo | 4G | x | auto | x | x |
I found a Yoigo mcfg_sw.mbn. Its possible to “install” it to try?
Do you have an update about outgoing SMS for Vodafone Romania or Orange Romania?
Have you tested also in Digi Romania?
What about 5G in Romania?
No 5G in SFOS support on any device.
EDIT: clarification about OS not location.
There seem to be 5G available in at least main cities in Romania.
1 Like
We have covered 40 main city on Orange Romania and I want to know if SFOS support 5G with Xperia 10 IV.
I read a topic on this forum that the eSIM not working on SFOS.
I edited my answer for clarity.
2 Likes
To clarify, there is 5G data in Xperia 10 IV and 10 V but no VoNR.
VoNR or ‘Voice over New Radio’ (also referred to as Voice over 5G or Vo5G) is a 5G high-speed wireless communication standard for mobile phones and data terminals, including Internet of Things (IoT) devices and wearables.
8 Likes
In case anyone else reading this was also still wondering, I asked them a while ago and it turns out they neither support VoLTE nor know when they will (be able to) support it.
Has anyone tried VoLTE in the network of Norwegian ICE?
In Xperia 10 V (the problem was that the SIM card was very old and did not support VoLTE, I changed it and it seems that now it works fine.)
| Country | Provider | Connection Icon | Registered | Registration | Sms Capable | Voice Capable |
|---|---|---|---|---|---|---|
| ES | Yoigo | 4G and 5G | ✓ | auto | ✓ | ✓ |
3 Likes
Hi, I’m interested to try Dark Start but I’m not able to register in volte, could you please provide the APN for Dark Star? thanks!
Device: Xperia 10 II
Country: BG
Provider: A1
Date tested: 2025-11-02
Registered ✓
Voice in ✓
Voice out ✓
SMS in ✓
SMS out ✓
To achieve it, I enabled 4G calling (beta) in the phone settings, then did the following (while ssh’d into the phone from my laptop)
devel-su
getprop persist.vendor.somc.cust.modem0 # prints `S8827.1`
cd /vendor/oem/modem-config/
mkdir S8827.1
cd S8827.1
echo -n "mcfg_sw/generic/common/default/vl/global/mcfg_sw.mbn" > modem.conf
… and rebooted the phone. Voila! 
4 Likes
Device: Xperia 10 II
Date tested: 11.11.2025
SFOS version: 5.0.0.72
Country: RS
Provider: Yettel
Registered: ✓
Voice in: ✓
Voice out: ✓
SMS in: ✓
SMS out: x
MMS in and out: didn’t test
This is what I did to make it work:
Pressed the switch for LTE in settings, and then
devel-su
getprop persist.vendor.somc.cust.modem0
The result: “S191.1”
cd /vendor/oem/modem-config/
mkdir S191.1
cd S191.1
echo -n “mcfg_sw/generic/common/default/vl/global/mcfg_sw.mbn” > modem.conf
I rebooted the device, and worked after rebooting.
I’ll have to tinker a bit and see what’s going on with SMS sending (I tried switching to 3G and 2G, but I still couldn’t send it).
1 Like