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NEW YORK (AP) – T-Mobile said unlimited plans will be the only option for new customers even though they are more expensive than some of its old, limited plans.

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The company had said in August that it was phasing out its other plans in favor of unlimited. On Thursday, T-Mobile said those limited plans, which executives called a “relic,” won’t be sold anymore starting Jan. 22. Existing customers can keep their current plans.

While some existing customers could switch to the $70-a-month unlimited plan and save money, others would pay more, according to prices on T-Mobile’s website.

Most customers who just pay for one or two lines or who have a lower-data plan — two gigabytes per line — would save money by sticking to what they have. For example, a family of four getting two gigabytes per line was paying $100 a month; with the unlimited plan, that costs $160.

T-Mobile is still trying to lure users who don’t use much data by offering them a $10 credit if they use two gigabytes or less per line. A smaller rival, Google’s “Project Fi,” already credits customers for data they don’t use.

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And T-Mobile’s unlimited plan isn’t exactly unlimited. If the network is busy, T-Mobile may slow speeds on customers that used more than 28 gigabytes. And video gets degraded to DVD-level quality unless customers pay an extra $15 a month for high-definition video and some other upgrades.

The company will still offer cheaper prepaid plans as well, where you pay upfront.

T-Mobile also said that wireless bills will no longer come with taxes and fees on top of advertised prices for the unlimited plan. T-Mobile said it isn’t raising prices to factor in the fees. Those extra charges typically come to about several dollars per line, Mike Sievert, T-Mobile’s chief operating officer, said in an interview.

T-Mobile announced the new policies at the CES gadget show in Las Vegas. The show runs through Sunday.

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