iphone 5 wifi issues (6.0.1 & 6.0.2)

Hi,

I have problems with my iphone wifi connection - i can't seems to connect to any wifi connection...

after entering the password i get a an error "Unable to join the network ..."

i tried upgrading to 6.0.2 - but it doesn't resolve the issue.

i tried also doing restore to network defaults - also doesn't fix.

also doing forget this network and trying again.

also doing restart to the device - doesn't work.

i got this phone at the US - and i live in israel so going into apple store is not an option...

and ideas?