i have wi-fi address but wi-fi greyed out??????

Hai, I too had the same problem. It came only after i updated my phone to IOS7. It was good for two weeks and suddenly the wi-fi greyed out. As my phone s not covered under warranty i searched net to find a solution. Did basics like Resetting network settings, restoring phone and everything thats on the blogs. A weired method gave my wi-fi back. As my phone is not under warranty i went for a toss. Initially i turned off my phone and left in fridge for ten minuts and then switched it on. My wi-fi was on for 1 hour and again it went grey. Control centre indicates wi-fi is on but the switch is turned off. I did again reset the network settings and switched off the phone. Now i opened the back case and heated the phone(at area where wifi chip is present) with help of hair drier for two minuts. I allowed it to cool for 30 mints and then switched it on again. To my surprise my wi-fi is back. I dont know if i can suggest this crude method to u but if u are out of warranty there is nothing to loose. Will update in case if it fails or continues to work. Hope this info will help some folks.