apple iphone 4s (16GB) !

hi here for sale i have my iphone 4s (16gb) phone was working 100% up untill i stupidly decided to restore it and now cant seem to activate it as it says insert correct sim and as i only have a 3 sim it wont let me active it, also because i dont know anything about phones i rather not mess with it. phone comes with box, charger and usb, phone is still under warrenty. no whilheld numbers plz as theyy have bein block via my carrier.