Not sure how many gigabytes you need in your data plan? Here are some basics on how much data services cost, and what activities to avoid.

Choosing the right size data plan will let you use your phone to its fullest, without overpaying for a plan you don’t use or expensive overages. Here’s how to size up your usage.

Sorry folks, but if you're with AT&T, the data that you're paying for as part of your data plan can only be used in any way that AT&T says it can be used.

What does data plan actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.

Unlimited plans aren't truly unlimited, as nearly every carrier has a fair use policy. But what is excessive use exactly?