T-Mobile USA has just posted its first-quarter 2011 earnings report, and the results aren’t all that hot. While the nation’s fourth largest carrier did increase contract APRU to $52 — up $1 year-over-year — it posted a decline in virtually all other business vitals. T-Mobile posted 99,000 net customer losses — 471,000 contract net customer losses paired with 372,000 prepaid additions. T-Mobile’s 33.63 million customers generated $5.16 billion in revenue and $135 million in net income — down from $5.28 billion and $362 million respectively year-over-year. A link to the full report is after the break.