T-Mobile USA has announced Q4 results -- eclipsing the 25 million subscriber milestone for the first time. The carrier is by far the smallest of the four national wireless telecoms by a long shot, but is adding customers at a fast mobile clip. Cingular, the nation's largest carrier, recently announced they have surpassed the 60 million+ subscriber mark.

T-Mobile released the customer milestone new along with the big Q4 2006 earnings statement. Several interesting metrics were included:

1) 900k net new customers in Q4; nearly 800k of those were post paid
2) 1.6 million BlackBerry and Sidekick users -- data centric
3) Churn has remained the same versus the year ago period