Have you done a sim swap recently, or moved your number from another network @KS4 ?
If no, then try your sim in another phone or another sim in your phone to see where the fault is.
Failing that you would need to get in touch with customer services to try a new sim in the first instance - alternative numbers to try and hints on getting through in the guide below:
Guide: Coronavirus Community Help and Support
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 Do not publish personal details (email, phone number, bank account).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
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