You might need a new sim @Bob4725 it depends how long you have had the sim. Try it and see, so long as you are in a 5G area.
If you do need a new one, you can either get one from a local shop, or by calling customer services on 202 or message them on social media:
Facebook (https://o2uk.co/O2CFB) , Twitter (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG)
Please note, this is not customer services and we cannot access your account. Do not publish personal details (email, phone number, bank account).
Link to our guide on how to contact them can be found here
