iPhone Sky Wifi Router Problems

Hi, I recently dropped my iPhone 6. Now I can't connect to my Sky Wi-Fi router unless I'm stood next to it. It seems like a strange issue, as this occurs everywhere I go that has Sky internet, all other internet providers seem fine, just Sky! I have visited the genius bar and the guys there aren't sure of what the problem could be, I've reset my network settings, reset my router, reset my phone to factory settings, I'm at a loss as to what else I can do! My other devices (iPad, wifes iPhone) have no issues connecting. Any one else have this issue, or any solutions? Thanks!