HT1695 My wi-fi option is greyed out and I am unable to turn it on and connect to wifi. How can I fix this?

A few days ago my iphone decided to stop connecting to wi-fi. I tried to connect to different wi-fi connections but my phone does not pick up any. Now my "turn wi-fi on" option is greyed out and I am unable to turn it on. I have tried reseting the network connections as well as reseting the iphone back to original settings. My network provider couldnt help. I dont know what else to do??

I had same problem. I removed the back cover, and warmed wi-fi module by hairdryer of my wife). five days wi-fi works great. I do not know what will happen next.
during operation iphone must be turned off. time of heating is near five minutes. wifi module is located upper the battery, on the upper right corner of device.

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