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Cellular connection failed, update failed, error message was doubtful

Suddenly my phone cannot catch cellular data and started to require update. So tried to update via internet, and checked connection; it seems connecting, but update failed, message said because internet no longer connected. How can I solve my problems?

Posted on Feb 5, 2022 5:24 AM

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Question marked as Best reply

Posted on Feb 5, 2022 7:45 AM

Try to optimize the range of the mobile network, see this Apple article:

If you see No Service or Searching on your iPhone or iPad

https://support.apple.com/en-us/HT201415

 

Check also the Wi-Fi network, see the following Apple articles:

Connect to Wi-Fi on your iPhone, iPad, or iPod touch

https://support.apple.com/en-us/HT202639

 

If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network

https://support.apple.com/en-us/HT204051

3 replies
Question marked as Best reply

Feb 5, 2022 7:45 AM in response to noriko224

Try to optimize the range of the mobile network, see this Apple article:

If you see No Service or Searching on your iPhone or iPad

https://support.apple.com/en-us/HT201415

 

Check also the Wi-Fi network, see the following Apple articles:

Connect to Wi-Fi on your iPhone, iPad, or iPod touch

https://support.apple.com/en-us/HT202639

 

If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network

https://support.apple.com/en-us/HT204051

Cellular connection failed, update failed, error message was doubtful

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