Research In Motion is going to sell the BlackBerry Curve 9315 on T-Mobile’s network. The 9315 retails for only $49. The Equipment Installment Plan for the phone will cost $10 per month. The 9315 has a 3.2-megapixel camera, a microSD memory card expansion, 3G connectivity, FM radio, and QWERTY keyboard. The phone looks like one of the classic BlackBerry devices. RIM’s newest operating system, BlackBerry 10, is expected to debut on January 30th.