Such offerings have helped it lure subscribers away from its rivals such as larger rivals Verizon Communications and AT&T Inc and smaller competitor Sprint.
T-Mobile said it added 2.2 million customers on a net basis in the first quarter ended March 31.
The company said it now expects to add 3.2 million to 3.6 million postpaid customers on a net basis in 2016, compared with its previous forecast of 2.4 million to 3.4 million.
T-Mobile said revenue jumped 10.6 percent revenue to $8.6 billion.
T-Mobile reported net income of $479 million, or 56 cents per share, for the first quarter, compared with a loss of $63 million, or 9 cents per share, a year earlier.