Unbilled data from prior months?

[benty]

Got my bill for the month and its $15 over previous months because of an unbilled data charge. I've never gone over my 250MB limit so how is it possible to be charged for unbilled data and how do I see when that was from?

[tikibar1]

See if the info. in this thread helps:

Unbilled Data From Prior Months

[#3]

it could be roaming .if you were roaming on another network that network sometimes takes several weeks to report that usage to Verizon.