Photo could show Nokia's first Mango phone, the Nokia 703

A leaked photo purportedly showing Nokia's first smartphone using Mango, the latest version of the Windows Phone operating system, depicts the handset as a full touchscreen device with no physical buttons on the front.

The low-quality photo, which has appeared on several blogs, including Slashgear , calls the device the Nokia 703. Other blurry specs in the photo describe it as having a 3.7-in. display, with 8GB of storage , 512MB of memory and a 5-megapixel camera able to shoot 720p HD video at 30 frames per second.

Nokia officials could not be reached to comment on the Nokia 703 picture.

Nowhere does the photo call the device a Mango phone. Recent Microsoft blogs are now saying Mango is equivalent to Windows Phone version 7.5 . Keen-eyed bloggers have noticed that the device in the photo is similar to one code-named Sea Ray that Nokia CEO Stephen Elop showed to employees in an internal company video that appeared on Hungarian Web site Technet.hu in June.

In that video, Elop says the Sea Ray device has an 8-megapixel camera, not 5 megapixels, as the blurry Nokia 703 picture shows. Elop compared the Sea Ray device to Nokia's MeeGo-based N9 smartphone , released earlier in June, which has a 3.9-in. display, bigger than the 3.7-in. display in the purported Nokia 703.

The blurry photo also includes the information, "General, 27 November," which could be a release date. The general belief is that Nokia will officially announce its Mango device in October, making the November release date a logical one.

Slashgear theorized that the 703 model number could put it in a class with new Symbian Belle phones from Nokia with the model numbers 700 and 701. However, the Belle line also has a 600 model, with a 3.2-in. display, quite different from what the 703 would have.

The Belle phones come with Near Field Communication chips and 1 GHz processors.

Matt Hamblen covers mobile and wireless, smartphones and other handhelds, and wireless networking for Computerworld. Follow Matt on Twitter at @matthamblen or subscribe to Matt's RSS feed . His e-mail address is mhamblen@computerworld.com .

Read more about smartphones in Computerworld's Smartphones Topic Center.