Contract Phone and SIM card?

I have a contract with O2, I lost my SIM card and was wondering how I would go about cancelling the SIM card so that nobody can run up a bill under my name.



How would I go about changing my contract to a new SIM card?

Also how and where would I get a SIM card



Thank you.Contract Phone and SIM card?
Just go get a new sim card registered for the number, and the previous one no longer works. Guaranteed.Contract Phone and SIM card?
Just call your service provider and inform that that you have lost your sim card. they will you to go to one of their stores to get a new sim, which you need to pay for and to keep your same number you will need to do a swim swap. make sure to take your purchase documents with you and id for proof that it is actually yours.