Samsung SGH-T379

The Samsung Gravity TXT, also known as the Samsung SGH-T379 is a T-Mobile exclusive messaging phone by Samsung, released in the third quarter of 2011.

The phone has an optical joystick which sets it apart from the other phones in the Gravity series. It also has a normal 3.5mm headphone jack, something uncommon in other Samsung feature phones from this time.

Cosmetically, it's mostly grey with a slightly rubberized back, but the sides and keyboard can come in 2 different colors (orange and cyan).

As with many Samsung phones of this time, it is Swift SoC based.

Batteries

 * Samsung EB42455VA (3.7 V, 1000 mAh Li-ion)

Flash support
Adobe Flash .SWF support isn't documented anywhere at all in the phone's user manual. However, the phone does have Adobe Flash Lite included, which allows Flash content up to version 7 to run.

mXMF audio support
.mxmf file support isn't official on this phone. Most of the system sounds are .mxmf files, which means the device can play that file format. However, when you try to play .mxmf files on an SD card, it will display an "Unsupported File" message. mXMF files can be played with some steps.

To play mXMF files, first play an officially supported file type (like .MID), and then navigate to the .mXMF file using the optical joystick. If the mXMF file is valid, it will start playing.

Dial codes
These are codes entered on the dial screen which can open up more hidden features like debug options. Such strings can be found on dumped firmware by searching using a hex editor.

*#0206*377# - Dumps RAM to UART (does not work on retail phones)

*#0*# - LCD Test

*#6984125*# - Admin Setting (*#9072641*# for master key, *#73561*# for operator key)

*#33284*# - Debug Level Menu

*#197328640# - Service Menu

Firmware
Three firmwares are currently available, all of which are of the same firmware version.
 * T379UVKF9 firmwares