Given the likelihood that one of the rivals of the iPhone 4S will be the Nokia Lumia 800, a comparison of their features is in order.

The iPhone 4S is 9.3 mm thin and weighs 140 g. Lumia 800 is 12.1 mm thick and weighs 142 g.

The iPhone 4S, equipped with the recently announced iOS 5, is touted as being very simple to use. Lumia 800 is equipped with Windows Mango 7. Windows Phone 7 has seen little interest in the market since its debut last year, so both Microsoft and Nokia are working hard to turn their positions around, with Nokia calling its new model the first real Windows Phone.

The iPhone 4S has an 8-megapixel camera capable of capturing 1080p video footage. Lumia has an 8-megapixel camera with Carl Zeiss lens on the back but unlike Apple’s phone, it doesn’t record 1080p HD video, only 720p. Nokia’s phone also has the lowest display pixel density at 800 by 480 pixels. The Lumia 800 lacks a front-facing camera for video calls.

The iPhone 4S has a 3.5-inch screen and a retina display of 960x640-pixel resolution at 326 ppi. The Lumia 800 has a curved 3.7-inch screen and offers a lower 480x800 resolution.

The iPhone 4S is powered by a dual-core A5 chip, which also has dual-core graphics capabilities. It has 1GHz dual-core chip with 512MB of RAM. The Nokia Lumia does not feature a dual-core processor: it has a 1.4GHz single-core processor with 512MB of RAM.

Nokia didn’t say which U.S. carriers would sell the Lumia 800. The phone will be available in November for around $584, unlocked.