Despite its lesser specifications and its lack of an LED flash for its camera the device doesn't look like it will be very slim. However it promises to offer a $150 off-contract price in select markets, which is quite affordable for a smartphone.
You can watch the leaked video demonstration of the Lumia 510 below
The Lumia 510 is reported to launch in early 2013 and China will be the first to get their hands on the device. Currently there is no indication on which countries will get access to it.
source – PhoneArena