New SIM card

[Pam7]

I recently upgraded my phone but have been sent the wrong SIM card.. it doesn’t work cannot receive messages. Need a new one sent as not been sent the right one for the contract I took out 

[TallTrees]

Hi there @Pam7 

Welcome to the o2 Community forum 

You will need to contact O2 customer services here:

You need to contact O2.
Message them on Social Media. Facebook (https://o2uk.co/O2CFB) , Twitter (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG) or give them a call on 202 or 0344 809 0202

[MI5]

@Pam7 

As long as the sim is for a contract and not PAYG it makes no difference.

Try these tips Guide: Text Message Tips (not sent or received) 

If you still feel the need for a new sim, pop into your local O2 store (with photo ID) and they will swap it for free whilst you wait. Quicker than calling O2 and no risk of losing service.