The T-mobile (LG-K428) and MetrocPCS (LG-M428) models are available for purchase now.
According to a recent FCC filing which shows the device with the model number LG-K425, The LG K10 could be available from AT&T soon.
As you can see from above screen shot, The LG K425 supports AT&T’s 4G LTE network.
According to our sources, the internal code name for the LG K425 is M209n, and it is AT&T’s variant of the LG K10.
The LG K10 model variants (known so fa) includes, LG K428 (T-mobile), LG MS428 (Metro PCS), LG K420 (European), LG F670L/K/S (South Korea), LG K410 and LG K430.