My phone 4 will be arriving shortly from the apple site, but until I get it I wont be changing my mobile contract to a new sim only account, because the moment i change contract the old sim will be blocked [by T Mobile UK] and I wont have a phone, til the new one is dispatched. When I get my iphone through, will I be able to use it [functions of a itouch for example] download apps/settings from itunes etc, while I wait for new micro sim to be sent to me, under my new contract. Or is the phone unusable without a micro sim inserted? I have tried searching online and on this forum, but couldn't see anything related. Thanks in advance.