Just as other carriers are scaling back or phasing out unlimited data, T-Mobile is unleashing four no-contract unlimited plans targeted at budget-conscious, prepaid customers. Sound too good to be true? There's always a catch.

The $60 Monthly4G plan offers unlimited talk, text, and up to 2GB of data at 4G speeds—once you go over 2GB, your data speed will be slower. T-Mobile is also adding three inexpensive Pay by the Day options. $1 per day will get you unlimited text and calls for 10 cents per minute. $2 per day gets you unlimited talk, text, and 2G data. A $3 daily plan will get you unlimited talk, text, and data—the first 200MB of which will get 4G speeds. [T-Mobile via Phone Scoop]