Cause: The graying out of the wireless switch is caused by the change of wireless settings after upgrading the iOS6 system.
The fault mainly shows that the wireless switch turns gray and the wireless signal cannot be turned on. Even if the wireless switch recovers after the mobile phone has been left stationary for a period of time, the wireless signal becomes very poor.
resolvent:
1. Turn off the phone and pull out the SIM card. When the phone is turned off, pull out the SIM card and turn it on. The wireless option can successfully remove the gray limit.
2. Turn on the flash light on the back of the iPhone for a long time, and use flashlight applications and other methods to turn on the LED flash light on the back of the phone for a long time to make the back hot, which can fix this problem.
3. With the hair dryer method, the problem can be solved by taking apart the back of the i mobile phone, aiming at the reverse position of the upper camera, and blowing the hair dryer for 10-15 minutes with high wind and high heat.