Can oe tell what apps have used data?

I use very little data on my phone, looking at my provider's billing
it's usually only a few kB at a time with the odd 1Mb lump.  However,
while I usually remember to turn the phone off when I cross the
channel on a ferry from UK to France I sometimes forget and then even
1Mb costs a ridiculous amount (not roaming in the middle of the
channel!).

Fortunately I'm on PAYGO and rarely have more than £5 credit so that's
my maximum loss but it's still annoying having to top up at an
inconvenient moment.

I guess I could just turn data off and see if anything stops working.

--
Chris Green
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