New phone won’t let me call out

[RN]

Can anyone please help I have upgraded my iphone from a 7 to a 12. I have transferred all data accross however my new device won’t let me call out and keeps telling me call failed. I can however call out on my iPhone 7. I’m unsure what to do next. Do I clear everything off my iPhone 7 and restore to factory settings? Will this mean I can then call out from my new iPhone? When I go to settings on my new phone and then about and then network it says sim not provisioned. Please can anyone tell me what to do

Thanks

[Bambino · Accepted solution]

@RN If you were sent a new sim with your new phone you need to do a sim swap: SIM Swap: a mini guide (incl eSim) - O2 Community If you're not comfortable doing it yourself you can call into an O2 store, if you have one nearby, and they'll do it for you. Be sure to bring identification with you.

[MI5]

@RN 

Just put the sim from the 7 in to the 12.