VoLTE support tinkering

filip.k 12 November 2025 11:50 74

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! …

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