Lumia 720’s global variant RM-885 and Lumia 520’s variant RM-915 which is destined for Australia, North America, South America according to bluetooth listing earlier revealed by us.
Surprisingly T-Mobile specific Lumia 520 variant Lumia 521 or RM-917 hasn’t yet come to FCC.
Have a look at some disassembly pictures of Lumia 720.
Have a look at that camera unit in the second picture. It is responsible for second most talked about camera on a Lumia phone !!
Now some Lumia 520 disassembly pictures.