T-Mobile has launched the successor to the venerable Samsung Gravity messaging phone in the Samsung Gravity 2.The phone retails for $29.99 with a 2-year contract agreement and after a $50 mail-in rebate. As a reminder, this messaging phone is available in two color options: metallic pumpkin and berry mauve, and features a horizontal slide-out QWERTY keypad, a 2-megapixel camera, an MP3 player, a microSD card slot, A-GPS with TeleNav, Bluetooth and supports HSPA/UMTS connectivity (1700/2100 MHz).