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 11 unique useragent strings from mobile devices collected by WhichBrowser.

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Mozilla/4.0 (compatible, MSIE 5.0; Series80/2.0 Nokia9300/05.22 Profile/MIDP-2.0 Configuration/CLDC-1.1)
Mozilla/4.0 (compatible, MSIE 5.0; Series80/2.0 Nokia9500/4.51 Profile/MIDP-2.0 Configuration/CLDC-1.1)
Mozilla/4.0 (compatible; MSIE 5.0; Series80/2.0 Nokia9300/05.22 Profile/MIDP-2.0 Configuration/CLDC-1.1)
Mozilla/4.0 (compatible; MSIE 5.0; Series80/2.0 Nokia9300/4.53 Profile/MIDP-2.0 Configuration/CLDC-1.1)
Mozilla/4.0 (compatible; MSIE 5.0; Series80/2.0 Nokia9300/6.27 Profile/MIDP-2.0 Configuration/CLDC-1.1)
Mozilla/4.0 (compatible; MSIE 5.0; Series80/2.0 Nokia9300i Profile/MIDP-2.0 Configuration/CLDC-1.1)
Mozilla/4.0 (compatible; MSIE 5.0; Series80/2.0 Nokia9300i/5.50 Profile/MIDP-2.0 Configuration/CLDC-1.1)
Mozilla/4.0 (compatible; MSIE 5.0; Series80/2.0 Nokia9300i/6.04 Profile/MIDP-2.0 Configuration/CLDC-1.1)
Mozilla/4.0 (compatible; MSIE 5.0; Series80/2.0 Nokia9300i/6.27 Profile/MIDP-2.0 Configuration/CLDC-1.1)
Mozilla/4.0 (compatible; MSIE 5.0; Series80/2.0 Nokia9500/05.22 Profile/MIDP-2.0 Configuration/CLDC-1.1)
Mozilla/4.0 (compatible; MSIE 5.0; Series80/2.0 Nokia9500/4.34.0 Profile/MIDP-2.0 Configuration/CLDC-1.1)