So, i have an iphone 2G with 3.0 fw.

Everything after i updated to 3.0, jb and unlock went ok, phone worked great. I had only few apps, like Skype, Mobile Term.

Suddenly my carrier sais that i made 150MB traffic in 2 days, in 3 sessions, 2 of them at around 1 AM and one around 10 AM. My phone reports 40MB data traffic since last reset, wich is never (so i assume is from the moment i updated the fw, that's like 3 monts ago).

Is it possible that my phone could do 68MB traffic in one session by itself while i was asleep and not counting it?

You most likely have push notifications in a "broken" state, this is common if you hactivate your phone

Fix is to to install a free app that supports push notification from app store. Run app, say yes to enabling push notifications, then go to settings and disable push notifications. You can then delete the free app if u want.

You will then have push notifications properly disabled until the next time you restore your iPhone OS and jailbreak/hactivate again.

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iPhone 3GS 32GB factory unlocked (3.1; Pwnagetool, Cydia, OpenSSH)
iPhone 8BG (3.1.2; Pwnagetool, Cydia, OpenSSH)

Could that "broken" state came up by itself? Without doing any app instalation or anything? And then vanish?

And why only one session of 68 megs? I could understand a broken push making many small connections ... but a 3h one?

And how come the traffic doesn't show in settings->usage?