Iphone 5s Wifi Issue

i searched on thousands blogs and nothing.
Iphone 5s bought it last week from usa and my friend brought it to egypt
now i have the worest proplem ever
that i can't connect to wifi easly
i got to be 1-2 metters near the router
if not the iphone disconnect
i searched on google and i found that this is not in iphone 5s only
but it is in IOS 7

Apple Should listen to us .. and send an update so we can fix this proplem
so i don't wanna pay my money on mobile data !