Folks at evleaks have done it again. They claim that it is codenamed Garda and is destined for T-Mobile network. Its test scores have also been spotted in the GFXBench database. Do not get too excited as it is an entry level phone and Samsung has used all the plastic they can in the SGH-T399.
GFxbench shows that it has 1.4GHz processor backed by Mali 400 GPU. Its specs include 480×800 pixel resolution, and runs Android 4.2.2 operating system. The phone will be launched officially on October 18, 2013. twitter.