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After upgrading to IOS 12.4.1 several apps will not switch from Wifi to cellular data when I leave the Wifi area I am connecting to. (Just has message on top of screen "no internet") I even try closing the app and reopening it but it still will not work. Is it an IOS glitch or an app glitch?
iPhone 7 Plus
If this is limited to only certain apps check their permission to use cellular data. Settings/<app name>/Cellular Data
If this is limited to only certain apps check their permission to use cellular data. Settings/<app name>/Cellular Data
Just a really wild guess because you have not given much description yet... But the mention of Skype and open apps might be the clue. Is this something you notice because the app is open and in use as you leave WiFi coverage, and you notice a break in service? There might be a short delay when you get to the point where WiFi still exists but the signal is too weak to sustain data transfer, before the signal drops completely and routing shifts to cellular. This would probably be more noticeable in apps with heavy continuous/real-time data like Skype but you might not notice it so easily in something like email. See if that gives you any clues.
There is also a setting under Settings/ Cellular (Mobile) Data for WiFi Assist which allows connectivity to fall back to cellular when WiFi is poor rather than waiting for a complete dropout.
iOS 12.4.1? Please check again.
I have already checked that. Maybe I am only noticing it on the certain apps because they are already open. I know for sure it happens on Skype app.
Not switching from Wifi to Cellular internet on IOS 12.4.1
