The Useragent string is send as a header by every browser and identifies which browser, rendering engine, operating system and sometimes which device model is being used. The header is called User-Agent. Below is a list of 4 unique useragent strings from mobile devices collected by WhichBrowser.

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Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; IEMobile 6.12; en-US; KIN.One 1.0)
Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; IEMobile 6.12; en-US; KIN.Two 1.0)
Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; IEMobile 6.12; xx; KIN.One 1.0)
Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; IEMobile 6.12; xx; KIN.Two 1.0)