in simple terms it depends how much you use it.
I have included an extract form this document explaining the average data use
What is the average data usage per month?
Based upon 4 hour usage per day (based on 5 days/week)
the Sure Signal would generate around 360MB per month
of broadband usage.
If you wanted to work that out it would be 4.5MB for an hours chat.
EDIT: worth noting these are rough calculations and do not represent exactly how much data the device will use in a month
Nabs
