Telstra and Optus will delay the planned closure of their 3G networks in order to conduct a final public safety awareness campaign amid concerns that emergency services calls and medical devices could be affected.
Some 4G phones don’t support 4G calling correctly or with all networks.
Check whether your phone actually uses 4G (VoLTE) for calls – to sort-of test this, make a call while connected to mobile data and note whether the signal meter’s 4G indication drops to 3G(H+/HSPA) or something during the call.
A more insidious version of this issue is that some phones do VoLTE just fine, but only use 3G for 000 calls.
Some phones only support VoLTE with some networks. There’s a chance that an appropriate firmware upgrade could add support for some network/device combos.
Some 4G phones don’t support 4G calling correctly or with all networks.
Check whether your phone actually uses 4G (VoLTE) for calls – to sort-of test this, make a call while connected to mobile data and note whether the signal meter’s 4G indication drops to 3G(H+/HSPA) or something during the call.
A more insidious version of this issue is that some phones do VoLTE just fine, but only use 3G for 000 calls.
Some phones only support VoLTE with some networks. There’s a chance that an appropriate firmware upgrade could add support for some network/device combos.
I’ll add that some Xiaomi phones need a dialer code in order to enable VoLTE support. It’s only with the stock OS (custom ROMs shouldn’t be affected).