MetroPCS says that 6% of its subscribers are using its LTE network, which works out to 580,000 of its 9.5 million customers using 4G. 16% of the carrier's customers upgraded in the first quarter while 40% of these were customers moving on up from featurephones to smartphones. Higher costs from these upgrades and for promotions hurt MetroPCS' profit margin which came down despite the increase in revenue. MetroPCS has been spending money to expand its LTE coverage and by the third quarter of 2012, 95% of its CDMA footprint will be covered by LTE The pre-paid carrier does have a solution to raise its profit margin, which is to increase the number of its subscribers using LTE. To that end, the carrier will be offering low priced LTE models for the back to school season which will add more LTE users and widen profit margins.