I moved my sim card to my old phone Samsung A53 5G from my new phone Samsung S24 Ultra, so I could send away for screen repair. I cannot connect to any networks now and can only communicate on WhatsApp when using WiFi. Whenever I try to make a call I get a message saying "Not registered on network" I tried putting sim back in S24 but still not able to get on network. I cannot call Sky to get technical help,as get same not registered message.
