I have a similar "Internet unreachable" problem with 3 different versions of iOS: 8, 9 & 10. Unfortunately I can't reproduce it. The same problem occurs with 2 different mobile phone operators.

Here are the common facts I was able to register on an iPhone 6 running iOS 9.3.1.

  1. Mobile phone network is OK: no_Internet settings
  2. All other possible Network connecions are off (Bluetooth, Wi-Fi).
  3. Any web browser give an error message clearly stating the Internet is unreachable: Safari_no_InternetFirefox_no_Internet
  4. All other application using the Internet are endlessly looping without any clear error message.

It is clear that the iPhone either doesn't have a valid IP address or doesn't have a correct routing information to reach the Internet.

In such a case how to diagnose clearly if the problem is a software failure coming from iOS or a failure coming from the mobile phone network?

  • Are you using a Global Proxy (usually setup though Apple Configurator or an MDM) or do you have a VPN? – tyelford Apr 25 '17 at 20:56
  • Not on this mobile phone network connection at the time of this problem. But I use a VPN at some other times. I will check if the problem might be caused by an abnormal exit from my VPN and add this information to my question. – dan Apr 26 '17 at 5:44

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