VoLTE provider support

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! :slight_smile:

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