Reached my limit of tolerance with 'greyed out' and unusable wifi on my 4S after upgrading to iOS 7 and deafening silence from Apple. No help from the store as my phone is 2 years old and no solution anywhere. Shame, as the phone is in good condition otherwise. So, with a heavy (but angry) heart, have ordered a Motorola G to have an introduction to Android. (For anyone in the UK, Tesco are doing a stonking deal!) Still love my Air, but am seriously fed up with Apple's hegemony and arrogance. So, if anyone's made a similar move, would welcome any tips.