Nokia's Lumia 510 Windows Phone was revealed in Chinese certification documents last month, but it's now been fully detailed on video. YouTube user Rafael Rosales has posted a full look at the unreleased handset, and GSM Arena claims it will debut at $150 initially.

The Lumia 510 will include a 4-inch display, 5-megapixel camera, and 800MHz processor — making it one of the low-end Windows Phones in Nokia's lineup. It also runs Windows Phone 7.5 at the moment, and we understand it will be upgradeable to the 7.8 release. Nokia is also planning another 4-inch low-end handset, codenamed the Flame, running Windows Phone 8. The Lumia 510 is expected to debut as early as the holiday season, with greater availability in early 2013.