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Im with O2 and it took the guy in the shop less than 5 min to get the details for your old sim (i had my old phone with me which a text varifiaction pin number was sent twice), my old sim was then de-activated in less than another 5 min but could of took up to 24hrs he said. All you have to do then is put in your new micro sim in your new phone....job done, they don't charge and you keep your old phone number.
Im with 02 just now and going back to 02 on the new contract but buying the new contract via a online retailor.. i assume that 02 would still sort this in the shop?