having a look at yourtelecom and the new c510a was connecting to the data network every 5 minutes even in the middle of the night since Saturday when it was connected - so thats meant that we've been charged $1 per day even though we hadn't been using data.

Turns out that by default the phone had created an email account called 'xtra' which is by default set to check every 5 minutes, easy enough to change to check never but since we hadn't created an email account didn't expect it to be active.

If you've got a 510a might pay to check otherwise it could add another $30 to your bill each month without realising it.