T-Mobile added 2.4 million customers during the first quarter of 2014, a 579,000 increase compared to the same time last year, as it seems customers are taking advantage of the company's aggressive discounts.

The mobile operator's revenue increased 47 percent to $6.88 billion in the three months of 2014, through March 31, thanks to promotions and discounts that have been a headache to companies like AT&T and Verizon, according to Reuters.

T-Mobile, which is two-thirds owned by Deutsche Telekom AG, lost $151 million, or 19 cents per share in the quarter compared to a profit of $107 million, or 20 cents per share, in 2013.

Most analysts had expected a loss of around 19 cents per share on revenue of $6.92 billion, according to Reuters.

The No. 4 U.S. mobile service provider added 1.3 million postpaid customers, who pay monthly bills, and 465,000 prepaid customers, who call for calls in advanced.

T-Mobile customer defections, or churn, was down 20 basis points from the fourth quarter and down 40 basis points from the same time last year, according to Reuters.

The mobile provider started their comeback late last year, after becoming sick of losing customers for close to four years to Verizon and AT&T. The company was able to turn the corner thanks to extremely-publicized wireless plans and savvy marketing.

T-Mobile, which calls itself the "Uncarrier," debuted a number of promotions earlier this year, including offering to pay for early termination fees for customers who decide to switch to T-Mobile from other carriers.

Other major wireless providers have since copied this strategy, and now offer some of the most aggressive price cuts the industry has seen, thus starting a "price war" to compete with T-Mobile. 

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