CAN I USE MY REGULAR O2 SIM CARD IN A IPHONE?

If I buy a new iPhone in an Apple Store for instance, can I use my regular O2 sim card or do I need to get a new one?
Thanks

The iPhone must be activated with O2. The SIM card used is "married" to the iPhone's IMEI number, so if the iPhone ships in the UK with a new SIM card pre-installed, there isn't any benefit to using your existing SIM card for the activation process unless your SIM card stores contact info which the iPhone can import. The iPhone can import contact info from the SIM card regardless if the SIM card is used for the activation process.

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