T-Mobile is capping off the first calendar year of its Uncarrier strategy with a quarter of more customer additions than its seen in years. T-Mobile says it hasnt done this well on postpaid since 2005. But despite the gain in customers, T-Mobile continues to take a hit on overall earnings, posting a loss of $20 million, compared to a loss of $8 million from the prior years quarter. In part, thats because T-Mobile has begun spending more money in order to get new customers — a cost up 40 percent year-over-year — and its ultimately seeing less revenue from some of the most valuable ones.