VoLTE support progress

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@irvinewade

I’m pretty sure that some users in Europe have successfully used VoLTE, so I wouldn’t assume that the E1 variant doesn’t have VoLTE support. It won’t be enabled out-of-the-box perhaps though.

FWIW, I’ve successfully used VoLTe with BASE/Telenet in Belgium, Europe. 4G stays on during the call and haven’t had any more problems than I had before since enabling it here.