Big Red has a policy under which you have 30 days to opt out of having your data sold to advertizers, otherwise your data is sold. Mobile developer Bryan Clark read the fine print and found about this, and here is the warning and the solution. For AT&T, you don’t have the 30-day limit, but still the carrier’s is pretty much the same as the one on Verizon.
“The quantity, technical configuration, type, destination, location and amount of use of the telecommunications services you purchase” can all be tracked and sold, according to Verizon’s terms.
If you want to opt out of that, here is a link where you can do so: