I just received a replacement iPhone due to my previous one being damaged. I kept my same SIM card and have inserted it into my new phone and it is not giving me any service to be able to make phone calls, send texts, use data etc.
I believe the SIM card is recognised as all the settings are there within the mobile data settings.
You need to contact O2. You can use Skype if you have no other phone to call on.
All numbers are in this guide Guide: Coronavirus Community Help and Support
When you call, you will be asked for the reason you are calling.
Stay silent for 15 seconds and you will be taken to the keypad options.
Press 2 for Everything Else
Press 5 for More Options
Press 7 for Anything Else which will put you though to someone.
You can also try saying "Upgrade" or "Fraud" to be connected to an advisor.
8.00am is the best time to call if you can.
Track usage, upgrade and get support with the My O2 appDownload My O2