O2 VoLTE Dies on Xiaomi in Older London Flats — What Support Won't Say
O2 VoLTE Dies on Xiaomi in Older London Flats — What Support Won't Say Reality check You live in a flat in London. Not a new one. One of those Victorian conversions in Hackney. Or a council block in Brixton. Or a mansion block in Earl's Court. Your Xiaomi shows signal. 4G. Sometimes 5G. But when you make a call, the network drops to 3G. Or the call fails entirely. You check Settings → Mobile network → SIM. VoLTE is ON. Everything looks right. This is where people usually get it wrong. They blame O2's coverage. They blame the building. They buy signal boosters. They switch to EE. The problem isn't the building. It's how O2's VoLTE handshake fails inside older London flats — and how Xiaomi's HyperOS handles (or doesn't handle) that failure. O2 support won't fix this. They don't know how. What actually breaks most often One thing. Not coverage. Not your phone. O2 uses a specific VoLTE frequency band (Band 20, 800MHz) for indoor coverage...