Re: Mobile data on

Ed Cryer <ed@somewhere.in.the.uk> wrote:

Something is switching on mobile data. I thought it was me for a
while; maybe a stray finger or thumb over the drop-down settings. But
it still happens occasionally, even though I've been very careful.
How can I find the app that's doing it?

What options are available likely depends on brand of phone, and maybe
even the model within a brand.  For example, with Samsung (maybe not all
of them), go to Settings -> Connections -> Data Usage, and use the menu
button. Select "Restrict Background" from the menu which stops automatic
enable of data.  Some phones reenable data when resuming out of sleep
mode.

Some folks say to disable automatic update of date and time: settings ->
Date & Time, toggle "set automatically".  Yet I thought cell phones got
their time sync from cell towers which get their time sync from GPS
satellites, not by the phone using data for an Internet connection to
some NTP server.

On my phone, under settings -> Network -> Wifi, menu, Advanced, there is
a "Switch fo mobile data" option which I have enabled.  When I leave
home to lose the wifi connect to my cable modem, I still want my apps to
connect online, like to Google Maps.

There are malicious apps that will reenable data, like a viral VPN app
that wants to connect to your phone from outside.  Because apps often
want data for Internet connections, and they can reenable data when
they're active, you might want to go to Data Saver settings to see if
Data Saver is enabled, and, if so, which, if any, apps are excluded.