[erfanullah]

What is the difference between these variants. I got 1520.1 having Hardware revision number 5.0.0.2. Is this OK?

I got a 1520.? with HW revision no. 4 initially but it had a defective mark on the camera sensor reflected in pics and videos in certain conditions and it had battery and overheating issues as well. So I got a replacement stated above.

Thanks!

[cure_remedy]

I had a 1520.1 (red) originally, the replacement nokia sent me is 1520.2 (white). I'm hoping to find the differences as well.

[Annabbzz]

I had 3 different lumia 1520s, white, 1520.1 version, 2 from china, 1 from italy. ALL OF THEM with the bright spots error on screen... And Nokia doesn't admit it as a known manufacturing error, they said "You had very bad luck" ¬¬

[Rawliglat x]

I guess its just another way of calling :

RM-937 - global version
RM-938 - US version with in-built Qi (Latin American)
RM-939 - WCDMA HSPA+ version (Chinese version)
RM-940 - AT&T version (only one without Qi)

I think the 1520.3 is the RM-938 (USA version).

If you live outside USA, my best guess is that 1520.1 is the RM-937 (global version).
If it doesn't have in-built Qi then the 1520.1 is just the AT&T version.

Not 100% sure, but that's what I think.

EDIT:
I think 1520.1 is the global version RM-937. Its listed on one of my local online stores (Europe).