I have what seems to be a reoccouring problem with my phone Samsung Galaxy S20 Ultra.
It at this moment in time is in good coverage. It has 4x Bars of 3G signal and sometimes switches in and out of 4G where I am. If I connect to my WiFi then it swaps to WiFi Calling.
I have just had a text message, then a Voicemail indicator, where someone has been calling me all afternoon and left 3 messages.
I just collected them (on wifi calling), I then rang my phone from the landline, there was a long pause (where the network is hailing the phone from the cell towers it last saw it) then it dumped onto voicemail.
I then switched off WiFi, and tried making a call within service from the phone, again at 4x bars 3G and attached to HSDPA. The result was "NOT REGISTERED ON NETWORK"
I placed the phone in flight mode and then back out, then made a call to and from it, and everything was absolutely fine.
Any suggestions? - Recently had a new SIM card but it was doing that before I had the new SIM, it was in fact provisioned in this handset not that it should make much difference.
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