T-Mobile can finally claim that it offers truly unlimited plans without the caveat of throttling.

The carrier announced late Thursday that it will now offer unlimited plans without data caps or speed limits beginning Sept. 5.

The new "Unlimited Nationwide 4G Data" plan will cost $20 per month when added to a Value voice and text plan or $30 per month when added to a Classic voice and text plan. For example, a single line Value plan with unlimited talk and text combined with unlimited data will cost $69.99, or a single line Classic plan with unlimited talk, unlimited text and unlimited data will cost $89.99.

The only limit T-Mobile is placing on the plans is that customers will not be able to use their smartphone to tether another device to the network.

T-Mobile announced its new plans just as AT&T prepares for the launch tomorrow of its Mobile Share plans, which allow customers to connect up to 10 devices to a single bucket of data.

Verizon's Share Everything plans are similar to those being launched by AT&T, while Sprint remains the only other major carrier offering unlimited plans.

T-Mobile has been openly critical of Verizon's Share Everything plans, calling them "costly, complicated and punitive."

In the past, T-Mobile has been criticized for calling its plans "unlimited" when in fact the company employed the practice of throttling, which slowed a customer's data speeds to a crawl once they used a certain amount of data each month.