Sacking off s3 for new iphone. Ordered sim free 32gb iphone5 from apple for friday delivery. Went into o2 today, picked up nano sim. Registered new SIM online through http://swapmysim.o2.co.uk/. Old mini sim turned off about 2 minutes later and new one was activated instantly. Put it in the supplied adapter and have put into s3 until Friday. Come Friday simply swap sim over and 'Robert is your uncles brother!' No queues, no phone calls. Surely nothing can go wrong now???? Anyone else done the hard bit already?