they have 3 version:
1. RMB 799 => TD-LTE, CPU 2.0, ROM 16G
2. RMB 899 => TD-LTE/FDD-LTE, CPU 2.0, ROM 16G
3. RMB 999 => TD-LTE/FDD-LTE, CPU 2.2, ROM 32G
1 and 2 are same in hardware, only different firmware.
but for mobile signal, all of them are same. they support same band mode. (so only...