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New T-Mobile promo offers three unlimited One lines for $100

U.S. carrier T-Mobile on Monday announced a promotion designed to attract new subscibers as well as keep existing ones, offering three lines of the company's unlimited One tier for $100.

The promo will be available to both new and existing subscribers beginning March 1, with the discount coming in the form of bill credits, T-Mobile said. Typically three lines cost $140, essentially making it a 3-for-2 deal.

Along the same lines, any customer with two or more voice lines will be able to add an extra line for free, regardless of whether they have One or a Simple Choice subscription.

The promo is due to run for an unspecified amount of time. People who sign up will of course be able to keep their extra line after the event ends.

T-Mobile's deal is just the latest salvo in an escalating battle between the four major U.S. carriers, all of which are trying to outdo each other in the unlimited arena. In practice, all of the recent plans are capped between 22 and 28 gigabytes, since throttling limits their usefulness beyond that point.

Earlier today AT&T announced revised unlimited plans set to take effect on Thursday. Both appear to address cost complaints about a plan introduced earlier this month, though the cheapest is limited to just 3 megabits per second.

Head over to AppleInsider's unlimited plans guide to see how the carriers' options rate.