I moved to Virgin Mobile a couple of months ago. I live in a good coverage area but have never got more than 1-2 bars indoors with any network - I chose Virgin because they support wifi calling which I had been using previously with o2 as a way to mitigate the horrible signal.
However, whenever I look at my phone it is disconnected from the network displaying either 'Refreshing Sim Data' or Emergency calls only. Assuming it was the poor signal causing the phone to lose connection to the network, I switched to 2G only mode which gets me up to 3 bars indoors (but for some reason disables the WiFi calling option) but still it will go from 3 bars to 'emergency calls only' and then 'refreshing sim data'.
Is my SIM the issue here? Any help would be appreciated, thanks!