I see that some sellers are using postfixes for Nokia Lumia models but I don't know what these postfixes mean.
For example, there is Nokia Lumia 720 but there is also Nokia Lumia 720.1 and Nokia Lumia 720.2
What does .1 and .2 mean and is there some official list of those numeric postfixes?
Here are links to some Internet websites using those codes: http://www.sahibinden.com/listing/alisveris-cep-telefonu-modeller-nokia-lumia-720.2-yil-distributor-garantili-128220728/detail
Those are mostly foreign sites, thus I suspect that these codes might have something to do with regions but I cannot find a list with all codes.