Predicting the next Lumia devices for 2015

[Zulfigar]

The Lumia 510 was a T-Mobile exclusive Lumia 520. Not sure why it's under 1st Gen.

 

[RumoredNow]

The Lumia 510 was a T-Mobile exclusive Lumia 520. Not sure why it's under 1st Gen.

The 521 was a T-Mo Branded 520...

 

[Aziz Abdurachman]

I think 510 is not exclusive since it's already country variants, and I put it on 1st gen because it has WP7.