WASHINGTON, DC (WUSA) -- T-Mobile is jumping back into the unlimited data plan pool for smartphones.

It sounds good, but there is a catch.

Customers will not be able to link their devices to a computer or use it as a mobile hot spot.

The 4-G plan will cost between $70 and $90 a month.

T-Mobile now joins Sprint as the only large national carriers to offer unlimited data plans.

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