I have just end loaded ios7 onto my iPhone 4S and now I do not get a wifi signal. In wifi settings, the on/off button is grey and will not change. Apple care referred me to my local apple shop and a total reload of the software was recommended . It soon became obvious from the discussion we had with the assistant that we weren't the first people with this problem. The reload of ios7 did not cure the problem, we still have no wifi signal. We have spoken with Apple after service again who say that it must be the phone itself which is faulty and because it is out of the warranty period have suggested they can sell us an exchange 4s with 90 day guarantee for £160. Sounds like quite an expensive down load from Apple!! As anyone else had this problem?