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[AlisonFraser]

I bought a new SIM card for my daughter’s first new mobile phone. I have gone to activate it in her mobile, and now my mobile phone will not make or receive calls. What do I do?

[MI5]

@AlisonFraser 

It would appear that you have upgraded your number by mistake.

You need to contact O2.

Guide: How to find help & contact O2 

[AlisonFraser]

Thank you. My daughter’s new mobile is now active with my number. Will I be able to put her SIM card in my mobile and it will work for me?

[MI5]

@AlisonFraser 

Yes you can and it will work, but your sim will have the contract you chose for her on it.

You will then need to get her a new sim to use in her phone.