T&C's here if required
http://www.o2.co.uk/termsandconditions/mobile/our-latest-pay-monthly-mobile-agreement"2. The Change-Your-Mind Period – If you change your mind about your Mobile Phone or selected Equipment you've got from us, you can return it once and exchange it for another within the 14 day Change-Your-Mind Period which will be communicated to you as part of the sales process and/or on your till receipt and then in your welcome pack. You'll only be able to do this if the Mobile Phone/Equipment is undamaged, unlocked (i.e. free of security or software locks), in its original packaging and you bring in your proof of purchase with it. If you'd rather, you can return your Mobile Phone/Equipment and cancel your Pay Monthly Mobile Agreement during the Change-Your-Mind Period. If you've taken your Equipment from us under a separate Hardware Plan and you are withdrawing from that Hardware Plan after the Change-Your-Mind Period, you will have to pay in full for your Equipment. If you've just taken Services from us then you can also cancel within the Change-Your-Mind Period. You agree that Services will begin immediately if you already have a SIM Card or when you receive that SIM Card. You'll have to pay for any calls, texts, data and other charges you've incurred, including during the Change-Your-Mind Period. For full details, ask in store or see below for our policy on repairs and returns. Details are in paragraphs 10, 12 and 13 of the Agreement and on our Website."
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