Sprint has this morning reported its financial results for the first quarter of 2013, and they show yet another loss for America’s third-largest carrier. The company announced a $643 million net loss on $8.79 billion revenue, though it did manage to generate a positive operating revenue of $29 million.

Sprint sold 5 million smartphones during the period, 1.5 million of which were iPhones.

Sprint has today announced its fourth quarter and full year financial results for 2012, and they don’t make for pleasant reading. Despite healthy smartphone sales driven by the iPhone, the carrier reported a loss of $1.3 billion for during the three-month period, which is the same figure it lost during Q4 2011. It also saw more than 1 million Nextel subscribers jumping ship.