The company, which is subject to a merger bid from T-Mobile USA, as part of Deutsche Telekom, revealed that net income rose to $193 million, at 52 cents a share in Q3 2012, from $69 million, at 19 cents a share a year earlier.
Total revenue also rose by 4% to $1.3 billion. It had net subscriber losses of 312,291 in the same period, as rivalling companies in the US ramp up their 4G LTE service offering.
Read our full report on the battle for 4G LTE market share in the US.