iPhone 5 cannot discover any WiFi network unless I am almost touching the router with iP 5. iPhone 5 also drops the signal when I go to the next room.
This iPhone was made in 37th week 2012. It's got display issue as well: http://www.youtube.com/watch?v=rbkro5...
Got replacement yesterday (from 36th week), the WiFi signal was finally like it should be, but I had slow connection - under 1MB/s at first. Today everything is working great:) I've got full WiFi speed and full signal in the whole flat like I used to have with iPhone 4:)