Are you pay monthly or pay as you go @Joanna123 ?
If pay monthly, are your bills up to date?
If pay as you go, when was the last time you topped up and used some of your credit?
See if any of the guides below can help, but it would be useful if you came back to give some more information.
Guide: How can I sort out my network issues?
Guide: Is the network down for me or everyone?
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 Do not publish personal details (email, phone number, bank account).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
