Good news for all the O2 customers out there who have been trying to get their hands on a new Micro SIM card for the iPhone 4, as we have just checked whith a number of O2 stores throughout the UK ...

If you've already got the phone you want, SIM-only deals tempt you with cheap rates for just the SIM card -- but your phone will have to be either unlocked or locked to O2 in order to use this ...

O2 SIM cards. How you activate your O2 SIM will depend whether you are on a pay-monthly or pay-as-you-go deal. It will also depend on whether you’re already an O2 customer or are new to O2.