New iphone can’t make calls

[David02]

I have just gotten my new iPhone 13 in the post and put a new SIM card in it, backed up from my old iPhone is in progress. I have tried calling and it is just silent and stays on the calling screen but doesn’t call and when I try to text it says number not available, should I put my old sim in? Unsure what to do.

[Bambino · Accepted solution]

@David02 You can either use your old sim, which would only give you 4G, or if you're in a 5G area you can do a sim swap: SIM Swap: a mini guide (incl eSim) - O2 Community