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Do you mean you are using the same sim card or have you swapped to a different sim card?
If a different sim, you need to wait for the process to complete (keep rebooting the phone), but if the same sim, try it back in the iPhone and if it works, the Samsung is faulty.
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You need to contact customer services (borrow and phone or use a landline)
You may need a new sim Guide: How to find help & contact O2
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Hey @Brenda, did the suggestions above help you get your SIM and phone working since you last posted? It'd be great to know how you're getting on 
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