The Samsung Gravity was one of T-Mobile’s first messaging phones, and while we liked it, it did not have a lot of features. It had no 3G, no GPS, and only a 1.3-megapixel camera. However, its sequel, appropriately dubbed the Samsung Gravity 2, fixed all that. The Gravity 2 not only has 3G, GPS, and a 2.0-megapixel camera, it is thinner and sleeker than its predecessor. The Samsung Gravity 2 is available for $30 with a two-year service agreement, which makes it one of the most affordable 3G messaging phones around.The Samsung Gravity 2 retains the same overall design as the Samsung Gravity. It has a candy bar appearance when viewed on the front and slides to the right to reveal a full QWERTY keyboard. However, it is a bit smaller and thinner at 4.5 inches long by 2.1 inches wide by 0.6 inch thick (Compared to the 4.53 inches by 2.07 inches by 0.7 inch measurements on the Samsung Gravity), the keypad layout is slightly different, and the display is 2.3 inches diagonally instead of 2.1.Speaking of the display, it has support for 262000 colors with a rather nice QVGA 240×320-pixel resolution. The screen looks bright and vibrant, which shows off the colorful animated images. You can adjust the menu interface to either a grid style or a circle style. Other display settings include brightness, the backlight time, and the dialing display. For the latter, you can adjust the type, size, and color of the dialing font, plus the color of the background when dialing. You can also …