Sudden large jump in roaming data usage-very weird

I travel internationally a lot and have a 100 MB international data plan each month. I reset the iPhone's usage statistics to track my usage and until a few hours ago, had used less than 1 MB of cellular data. I then turned roaming on to check an e-mail (basic text, no attachments), had nothing else going on, and after shutting off Data Roaming noticed that my usage (received and sent) was over 70 MB, almost all of it ”received“ data. There is no way I could have downloaded over 70 MB of data on my MacBook Pro in that time frame over WiFi, let alone on an iPhone via 3G. I've not known the iPhone's usage statistics to be error prone, but have no other explanation. AT&T's billing site hasn't updated yet so I'll have to wait to see what the ”official“ usage was, but has anyone else seen this? Again, I started with less than 1 MB and that jumped to over 70 MB within a minute or two of e-mail use without attachments. In contrast, I spent several days in Switzerland recently and even used the iPhone to check Maps using GPS and only used 15 MB total.

That is a rather large jump but could be down to almost anything.
Youtube, Itunes, BBC player and any oneline streaming website.
Do you have multiple computers that did a windows or software update during the month?
If all else fails, change the password to your wireless router.
If I've helped, just click the Star - Every little bit helps
If you can't fix it with a hammer, you've got an electrical problem.

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