22-03-2023 10:16 AM
22-03-2023 10:17 AM
22-03-2023 02:10 PM - edited 22-03-2023 02:11 PM
Since it's an iPhone it's probably due to the silly Apple process for activating iPhones on certain networks with a new SIM.
You'll probably have to put €1 cash credit on your account, switch it off and then on again and then wait a little while to see if it activates.
This process involves the phone silently sending an SMS to a UK activation server but if there's no cash credit on the account to pay for the international text then it also fails silently.