So my work mobile is on Vodafone and today I received two phone calls, one from Wellington and the other from Auckland about an hour apart.

 

In both cases, after about 20 seconds the call disconnected abruptly and then the following voice announcement played: "The number you have called is not currently active, or is invalid. Please check the number and dial again.

 

The thing is, they called me not the other way around. The phone was on speaker and my hands were no where near it.

 

iPhone XS Max with VoLTE enabled.

 

I only get 2 bars of 4G where I live, could VoLTE be the issue if its switching between 4G and 3G? @Linux ?