Wireless carriers get their monthly take from you, but they're cashing in on you in other ways, too — unless you tell them otherwise: Carriers sell information about your mobile Web searches and other data to marketing companies.
The good news is, you can easily opt out of providing such info. The bad news is, it's mostly up to you to do so — no action on your part generally means they're sharing your info. To fix this, you go online to your account, and change your privacy settings. If you haven't looked at them in awhile — or ever — today's a good day to start.
