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Joined 4 years ago
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Cake day: February 20th, 2021

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  • 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.