Wifi drops when phone is locked after 10.3.3 update

Wifi drops when phone is locked or goes to idle and reconnect when screen is on.

This happens after the last ios update.


Model :iphone 5.

iPhone 5, iOS 10.3.3

Posted on Jul 31, 2017 4:32 AM

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Posted on Oct 25, 2017 7:49 AM

This is not anecdotal. I have been testing it with every iOS release. Nothing has changed. Here is how to actually test it:

  • On your phone go to Settings/Wi-Fi and tap on the i next to the network name
  • Write down the IP address
  • On your computer open a Terminal window (Mac) or CMD window (Windows)
  • Enter "ping <the IP address you wrote down>" (Mac) or "ping /t <the IP address you wrote down>" (Windows)
  • Note the phone responding to the ping command
  • Press the SLEEP button
  • Watch as the responses stop after about 30 seconds
  • To stop the pings enter <CTRL>+C.

Every time a major version is released I do this again. The response has never changed in 10 years.


Repeat the test with the phone plugged in; it won't go to sleep. It may wake up for a few seconds if the phone receives a notification such as a Push email alert, which is an external stimulus, but apps that originate communications will not wake it and will use cellular data.

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Wifi drops when phone is locked after 10.3.3 update

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