no service On iphone 5 64GB AT ALL

JUST HAD NEW IPHONE 5 64GB, CANT GET SERVICE, IVE REBOOTED, CHANGED TO FLIGHT MODE AND NOTHING.

I TOOK SIM OUT AND PLACED IT IN MY FRIENDS PHONE AND IT WAS OK HOWEVER WHEN I PLACED HIS SIM IN MINE IT CAME UP NO SERVICE.

IM ASSUMING ITS THE PHONE, HAS ANYONE HAD THE SAME ISSUE AND HAS IT BEEN RESOLVED?