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Why can't the US version of Apple 4s open wifi?
Generally, it may be a firmware problem, and the network settings or factory settings can be restored.

Solution of graying the wireless Wi-Fi switch of IPhone;

Some friends have been encountering the situation that the Wi-Fi wireless switch turns gray and cannot be enabled after using the iPhone for a period of time. Although there is no official reply to this question at present, many foreign and domestic regions have reported that they have encountered this problem. The online solution to this problem can be summarized as follows:

Official solution:

On Apple's official website, there is a webpage dedicated to guiding users to solve this problem: (iOS: Wi-Fi or Bluetooth settings are grayed out or dimmed).

In rare cases, you may not be able to enable Wi-Fi or Bluetooth in the settings of iPhone, iPad or iPod touch. If this happens, you will see the following symptoms:

You can't turn Wi-Fi or Bluetooth on or off because the settings are gray or dim.

Do not display Wi-Fi or Bluetooth MAC address, or set >; General > about all-zero display of this machine.

solve

If you encounter this problem, please perform the following steps and try to enable Wi-Fi or Bluetooth after each step.

Confirm that the flight mode is off.

Restart the iOS device.

Update iOS devices

Tap settings > general > restore > restore network settings to restore network settings.

Restore iOS devices in iTunes.

If you still can't turn on or off Wi-Fi or Bluetooth after trying the above steps, please contact Apple or your wireless carrier for other assistance.

Turn off the refrigerator and freeze 10- 15 minutes (for reference only):

Yes, you are not mistaken. Putting your iPhone in the refrigerator and freezing it for 10 to 15 minutes can really solve this problem. Generally speaking, many netizens can return to normal after freezing and can use Wi-Fi normally.

Ultimate hair dryer (for reference only):

Disassemble the back of iPhone, aim at the reverse position of the camera above, and blow 10- 15 minutes with a hair dryer. This method can basically solve the problem that most netizens' iPhone wireless connections are grayed out, but it can last for a long time. If this fault occurs again, you can still use this method to continue to solve it.