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 75 unique useragent strings from mobile devices collected by WhichBrowser.

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KWC-M1000/1.0.01 UP.Browser/6.2.3.9.g.1.110 (GUI) MMP/2.0
Lenovo G900
MOT-A1000
MOTORIZR-Z8/46.00.00 Mozilla/4.0 (compatible MSIE 6.0 Symbian OS 342) Opera 8.65
Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 158) Opera 8.60 [en-US]SonyEricssonM600i/R100
Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 246) Opera 8.60 [de]SonyEricssonM600i/R100
Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 246) Opera 8.60 [en]SonyEricssonP990i/R100
Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; Motorola A1000; 735) Opera 7.5 [en]./A1000./1.0 (compatible; MSIE 4.01; Windows CE; PPC; 240x320)
Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; Motorola A1000;698) Opera 7.50 en ./MOT-A925./P243
Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; Motorola M1000;811) Opera 7.50 [ja]./M1000./1.0
Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; Motorola M1000;817c) Opera 7.50 [ja]./M1000./1.0
Mozilla/4.0 (compatible; MSIE 6.0; Symbion OS; Motorola M1000; 811) Opera 7.50[ja]./M1000./1.0
Mozilla/4.1 (compatible; MSIE 5.0; Symbian OS) Opera 6.0  [de]./MOT-A925./P243
Mozilla/4.1 (compatible; MSIE 5.0; Symbian OS) Opera 6.0  [en]./MOT-A920./P325
Mozilla/5.0 (Java; U; en-in; UCBrowser8.3.0.154/69/352/UCWEB Mobile UNTRUSTED/1.0 SonyEricssonP1i/R100 Profile/MIDP-2.0 Configuration/CLDC-1.1
Mozilla/5.0 (Java; U; en-us; AppleWebKit/530.13 (KHTML, like Gecko) UCBrowser/8.5.0.185/82/352/UCWEB Mobile UNTRUSTED/1.0 SonyEricssonG900/R100 Profile/MIDP-2.0 Configuration/CLDC-1.1
Mozilla/5.0 (Java; U; en-us; UCBrowser8.2.1.144/70/444/UCWEB Mobile SonyEricssonG700/R100 Profile/MIDP-2.0 Configuration/CLDC-1.1
Mozilla/5.0 (Java; U; en-us; UCBrowser8.4.0.159/70/405/UCWEB Mobile SonyEricssonW950i/R100 Profile/MIDP-2.0 Configuration/CLDC-1.1
Mozilla/5.0 (Java; U; Id; UCBrowser8.2.0.132/69/452/UCWEB Mobile UNTRUSTED/1.0 SonyEricssonW960i/R100 Profile/MIDP-2.0 Configuration/CLDC-1.1
Mozilla/5.0 (SymbianOS/9.1; U; Series60/3.1 AppleWebKit/413 (KHTML, like Gecko) Safari/413 Digia @Web/2.1 SonyEricssonP1i/R100 Profile/MIDP-2.0 Configuration/CLDC-1.1
Mozilla/5.0 (SymbianOS/9.1; U; Series60/3.1 AppleWebKit/413 (KHTML, like Gecko) Safari/413 Digia @Web/2.1 SonyEricssonP990i/R100 Profile/MIDP-2.0 Configuration/CLDC-1.1
Mozilla/5.0 (Windows; U; Windows NT 6.0; xx; Desktop) AppleWebKit/534.13 (KHTML, like Gecko) UCBrowser/9.5.0.449 UNTRUSTED/1.0 SonyEricssonG900/R100 Profile/MIDP-2.0 Configuration/CLDC-1.1
NOKIA-6708
Opera/3.1 (FOMA M1000; U; FOMA; ja-JP; rv:1.1.2) Opera/20050207 Opera/3.11
RSSFeeds/R1A SonyEricssonP1i/R100 Profile/MIDP-2.0 Configuration/CLDC-1.1
RSSFeeds/R1A SonyEricssonP990i/R100 Profile/MIDP-2.0 Configuration/CLDC-1.1
SonyEricssonG700/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 878) Opera 8.65 [de]
SonyEricssonG700/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 941) Opera 8.65 [en]
SonyEricssonG700/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 958) Opera 8.65 [en]
SonyEricssonG900/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 878) Opera 8.65 [de]
SonyEricssonG900/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 941) Opera 8.65 [de]
SonyEricssonG900/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 958) Opera 8.65 [id]
SonyEricssonM600i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 276) Opera 8.60 [de]
SonyEricssonM600i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 306) Opera 8.60 [de]
SonyEricssonM600i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 405) Opera 8.65 [de]
SonyEricssonM600i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 513) Opera 8.65 [de]
SonyEricssonM600i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 513) Opera 8.65 [en]
SonyEricssonP1i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 598) Opera 8.65 [de]
SonyEricssonP1i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 598) Opera 8.65 [en]
SonyEricssonP1i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 636) Opera 8.65 [de]
SonyEricssonP1i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 661) Opera 8.65 [en-US]
SonyEricssonP1i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 701) Opera 8.65 [de]
SonyEricssonP1i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 701) Opera 8.65 [en]
SonyEricssonP1i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 701) Opera 8.65 [ru]
SonyEricssonP1i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 768) Opera 8.65 [da]
SonyEricssonP1i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 768) Opera 8.65 [de]
SonyEricssonP1i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 768) Opera 8.65 [en]
SonyEricssonP910i/R1A SEMC-Browser/Symbian/3.0 Profile/MIDP-2.0 Configuration/CLDC-1.0
SonyEricssonP910i/R2A SEMC-Browser/Symbian/3.0 Profile/MIDP-2.0 Configuration/CLDC-1.0 UP.Link/1.1
SonyEricssonP910i/R3A SEMC-Browser/Symbian/3.0 Profile/MIDP-2.0 Configuration/CLDC-1.0
SonyEricssonP910i/R4A SEMC-Browser/Symbian/3.0 Profile/MIDP-2.0 Configuration/CLDC-1.0
SonyEricssonP910i/R4A SEMC-Browser/Symbian/3.0 Profile/MIDP-2.0 Configuration/CLDC-1.0 UP.Link/1.1
SonyEricssonP910i/R5B SEMC-Browser/Symbian/3.0 Profile/MIDP-2.0 Configuration/CLDC-1.0
SonyEricssonP910i/R5B SEMC-Browser/Symbian/3.0 Profile/MIDP-2.0 Configuration/CLDC-1.0 UP.Link/1.1
SonyEricssonP990i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 283) Opera 8.60 [de]
SonyEricssonP990i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 306) Opera 8.60 [de]
SonyEricssonP990i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 306) Opera 8.60 [en]
SonyEricssonP990i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 405) Opera 8.65 [de]
SonyEricssonP990i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 513) Opera 8.65 [de]
SonyEricssonP990i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 513) Opera 8.65 [en]
SonyEricssonP990i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 598) Opera 8.65 [de]
SonyEricssonP990i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 598) Opera 8.65 [en]
SonyEricssonP990i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 598) Opera 8.65 [ru]
SonyEricssonP990i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 598) Opera 8.65 [sl]
SonyEricssonW950i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 323) Opera 8.60 [de]
SonyEricssonW950i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 323) Opera 8.60 [en]
SonyEricssonW950i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 405) Opera 8.65 [de]
SonyEricssonW950i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 598) Opera 8.65 [de]
SonyEricssonW950i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 598) Opera 8.65 [en]
SonyEricssonW950i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 598) Opera 8.65 [ru]
SonyEricssonW960i/R100 Mozilla/4.0 (compatible; MSIE 6.0; Symbian OS; 768) Opera 8.65 [de]
UCWEB/2.0 (Java; U; MIDP-2.0; xx; U2/1.0.0 UCBrowser/9.0.0.261 U2/1.0.0 Mobile SonyEricssonM600i/R100 Profile/MIDP-2.0 Configuration/CLDC-1.1
UCWEB/2.0 (Java; U; MIDP-2.0; xx; U2/1.0.0 UCBrowser/9.4.0.342 U2/1.0.0 Mobile SonyEricssonP1i/R100 Profile/MIDP-2.0 Configuration/CLDC-1.1
UCWEB/2.0 (Java; U; MIDP-2.0; xx; U2/1.0.0 UCBrowser/9.5.0.449 U2/1.0.0 Mobile SonyEricssonM600i/R100 Profile/MIDP-2.0 Configuration/CLDC-1.1
UCWEB/2.0 (Java; U; MIDP-2.0; xx; U2/1.0.0 UCBrowser/9.5.0.449 U2/1.0.0 Mobile SonyEricssonP1i/R100 Profile/MIDP-2.0 Configuration/CLDC-1.1