T-Mobile USA just announced its Q3 2012 financials, and both revenue and profits are down over last year: the company took in $4.9 billion, 6.4 percent less than last year, and earned $1.2 billion, a decline of 15.2 percent year-on-year. The mobile operator said while it earned more from equipment sales, it wasn't enough to offset an 8.7 percent drop in service revenue over last year. DevelopingFiled under: Cellphones, T-MobileT-Mobile USA Q3 2012 earnings: Revenue