Despite the fact that Verizon and AT&T have done away with `unlimited' data plans and made a strategic shift to capped, tiered data plans, T-Mobile USA has recently revealed that it will begin selling its fully unlimited data plans from September 5.

Though T-Mobile, like Sprint Nextel, already has the `unlimited' data option, whereby it does not charge its subscribers for overages but docks their speeds if they exceed their plan limit, the new plans that T-Mobile now intends offering will be `truly unlimited' data plans.

In other words, T-Mobile is bringing back the full, unlimited 4G data for $30 per month; with the subscribers no longer having to worry about going past their limit or the carrier slowing down their data to a practically unusable level.

With T-Mobile still to release its 4G LTE network and currently has a 4G HSPA+ network, the carrier said that its fully unlimited data plans will give the subscribers the advantage of unlimited 4G data at a cost of $20 per month on its unsubsidized "value plans," and $30 a month for plans which include unsubsidized phones.

This means T-Mobile will be offering its truly unlimited talk, text, and data at a price of $69.99 without a subsidized phone, or $89.99 with one. As such, the T-Mobile offering will cost the carrier's subscribers much less for the unlimited data option as compared to their counterparts who are using Sprint's Simply Unlimited plan, which costs $109.99 a month plus tax for a smartphone plan.