I’m having the same problem: Mobile data stops working for no apparent reason.
- SFOS installed over Android 11 (tried both 62.0.A.3.17 and 62.0.A.3.109, same result)
- SIM card works in Android 11 (I went back to Android several times => same phone same card work in 5G under android)
- Operator: Free Mobile (France)
- VoLTE disabled (Xperia 10III not supported by Free Mobile)
- No SDCard
- SIM card in slot 1 or 2 won’t make a difference.
- Connection set to IP/IPV6 etc doesn’t make a difference
- Same SIM works fine in XperiaX dual sim.
A sequence similar to what DrYak described above , but with disabled SIM2 - worked once after reboot. Mobile Data worked fine until next reboot.
Can’t reproduce the “working” pattern since (yet it did work - I installed mail app, calendar, etc - and I have not set any WIFI network)
I noticed it takes long to shut down/reboot - the red led remains on for around 20-30 seconds before reboot/shutdown
At this stage, my Xperia 10 III is unusable with SFOS and my operator , reverting to my old Xperia X.