So, while unlimited data may sound attractive, there is no practical effect of data limits on the majority of users." ... The main reason is no secret: data caps let wireless carriers charge higher prices for bigger monthly allotments and charge overage fees when customers exceed their caps.

Is it worth buying unlimited data?

A: On paper, unlimited data seems like a great deal. You can use your smartphone as much as you want and you'll never be charged for overages. Something about the word “unlimited” makes the plan seem more valuable. You'll never have to worry about exceeding your data caps again.

Is unlimited data really unlimited?

In the confusing, arcane world of cellular service plans, “unlimited data” often doesn't really mean unlimited. Instead, it means your speed gets reduced if you use too much. Yeah, you can slurp all the data you like, but you'll do so at nearly unusable speeds if you get too greedy.