this post was submitted on 14 Aug 2024
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[–] [email protected] 3 points 2 months ago (2 children)

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.

[–] [email protected] 1 points 2 months ago

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).

[–] [email protected] 1 points 2 months ago

Yep, this is me. Bought 1 yr vodafone prepaid, after getting reminded to enable VoLTE on my phone (a 2019 model), which I did. But, the phone doesn't actually do VoLTE calls, so come Vodafone's 3g shutdown weeks later I suddenly could no longer make or receive ANY phone calls. Internet/data works fine.

Ended up getting a cheap new phone just so I can make phone calls in an emergency.