We know that AT&T's sudden announcement that it will put a halt to unlimited data put a lot of you into a tailspin this morning, but now that you've had some time to come to terms with the change ...

Data can cost you big bucks if you're not paying attention. This article explains how to check data usage directly from an iPhone or Android phone or through a major carrier, such as AT&T, Verizon ...

Here's how to check your cellular data usage on an iPhone, and find specific readings for and manage each app's data.