640 Model numbers & variants

[EFats]

Found a thread here for 640XL, but not the 640. Wikipedia has some information but conflicts with some other sites.
What are the different model numbers for the 640 and what are the frequency bands each supports (I assume that is the only difference).

• RM-1072 : For AT&T & other "standard" GSM?
• RM-1073 : For US including T-Mobile AWS frequencies?
• RM-1074 : ???
• RM-1075 : ???
• RM-1076 : Single 3G only
• RM-1077 : Dual SIM 3G only

Anything else? I wish they would just keep things simple. I think like 650 has only single & dual SIM variant, right?

 

[Pololica]

I don't know the other RM, but 1072 is working for Europe. I bought mine from Vodafone Romania.

 

[Azlan Aziz]

RM-1075 : LTE Dual SIM CV-Malaysia(BLACK)..

 

[ahmed jehanzeb]

RM-1073 Metro PCS and Tmobile, single sim for the USA.