hi my brother bought me the galaxy s2 off e bay.ive had it for a month,it was brand new and even now not got a scratch on it.but all of a sudden it says iv got no network and there is a circle with a line in it at the top.ive called t mobil and they have said to take it to my nearest t mib store as I still have warranty but will they ask for receipt because it was bought from e bay through paypal.i can give them the proof of purchase via bank but would they fix it and if they cant fix it will they replace it?and how long will it take?help anyone please im really stresses cause of this!any help n advise will be much appreciated!