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 57 unique useragent strings from mobile devices collected by WhichBrowser.

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Mozilla/5.0 (BlackBerry PlayBook - RIM Tablet OS 2.1.0.1917; U)  Safari/537.36
Mozilla/5.0 (BlackBerry PlayBook - RIM Tablet OS 2.1.0.1917; U) AppleWebKit/537.36 (KHTML, like Gecko) Safari/537.36
Mozilla/5.0 (BlackBerry PlayBook - RIM Tablet OS 2.1.0.1917; U) Safari/537.36
Mozilla/5.0 (BlackBerry PlayBook - RIM Tablet OS 2.1.0.1917; U; xx) AppleWebKit/601.1.56 (KHTML, likeࡇecko) Safari/601.1.56
Mozilla/5.0 (BlackBerry PlayBook - RIM Tablet OS 2.1.0.1917; U; xx)ࡁppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2498.0 Safari/537.36
Mozilla/5.0 (BlackBerry PlayBook; U; xx) AppleWebKit/537.36 (KHTML, like Gecko) Version/2.1.0.1917 Safari/537.36
Mozilla/5.0 (PlayBook) AppleWebKit/537.10+ (KHTML, like Gecko) Version/date:       2012.11.19-14:date:       2012.11.19-14:date:       2012.11.19-14: Safari/537.10+
Mozilla/5.0 (PlayBook) AppleWebKit/537.10+ (KHTML, like Gecko) Version/date:       2012.12.12-15:date:       2012.12.12-15:date:       2012.12.12-15: Safari/537.10+
Mozilla/5.0 (PlayBook) AppleWebKit/537.10+ (KHTML, like Gecko) Version/date:       2012.12.13-02:date:       2012.12.13-02:date:       2012.12.13-02: Safari/537.10+
Mozilla/5.0 (PlayBook; U; Android 2.3.3; en-; PlayBook Build/2.0.0.56) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (PlayBook; U; Android 2.3.3; in-; PlayBook Build/2.0.0.56) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (PlayBook; U; Android 2.3.3; in-; PlayBook Build/2.1.0.147) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.0.0.51) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.0.0.56) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.0.1.29) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.0.1.30) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.0.1.42) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.0.1.42)Maxthon AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.1.0.131) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.1.0.131) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 360browser(securitypay,securityinstalled)
Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.1.0.131)Maxthon AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.1.0.147) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.1.0.147) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 bdbrowser/4.9.1.7
Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.1.0.147) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 Maxthon/4.1.8.2000
Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.1.0.147) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 MxBrowser/4.3.5.2000  Maxthon/4.3.5.2000
Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.1.0.147) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 MxBrowser/4.4.7.2000  Maxthon/4.4.7.2000
Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.1.0.147) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1; Maxthon (4.0.4.1000);
Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.1.0.147)Maxthon AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.1.0.48) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 1.0.0; en-US) AppleWebKit/534.11  (KHTML, like Gecko) Version/0.0.1 Safari/534.11
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 1.0.0; en-US) AppleWebKit/534.11+ (KHTML, like Gecko) Version/7.1.0.7 Safari/534.11+
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 1.0.0; en-US) AppleWebKit/534.8+ (KHTML, like Gecko) Version/0.0.1 Safari/534.8+
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 1.0.0; xx) AppleWebKit/534.11  (KHTML, like Gecko) Version/7.1.0.7 Safari/534.11
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 1.0.0; xx) AppleWebKit/534.11+ (KHTML, like Gecko) Version/7.1.0.7 Safari/534.11+
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 1.0.0; xx) AppleWebKit/534.8  (KHTML, like Gecko) Version/0.0.1 Safari/534.8
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 1.0.0; xx) AppleWebKit/534.8  (KHTML, like Gecko) Version/0.0.1 Safari/534.8 .
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 1.0.0; xx) AppleWebKit/534.8  (KHTML, like Gecko) Version/7.2.0.0 Safari/534.8
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 1.0.0; xx) AppleWebKit/534.8+ (KHTML, like Gecko) Version/0.0.1 Safari/534.8+
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 1.0.0; xx) AppleWebKit/534.8+ (KHTML, like Gecko) Version/0.0.1 Safari/534.8+.
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 2.0.0; en-US) AppleWebKit/535.8+ (KHTML, like Gecko) Version/7.2.0.0 Safari/535.8+
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 2.0.0; xx) AppleWebKit/535.1  (KHTML, like Gecko) Version/7.2.0.0 Safari/535.1
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 2.0.0; xx) AppleWebKit/535.1+ (KHTML, like Gecko) Version/7.2.0.0 Safari/535.1+
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 2.0.0; xx) AppleWebKit/535.8  (KHTML, like Gecko) Version/7.2.0.0 Safari/535.8
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 2.0.0; xx) AppleWebKit/535.8+ (KHTML, like Gecko) Version/7.2.0.0 Safari/535.8+
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 2.0.1; xx) AppleWebKit/535.8+ (KHTML, like Gecko) Version/7.2.0.1 Safari/535.8+
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 2.1.0; xx) AppleWebKit/535.8+ (KHTML, like Gecko) Version/7.2.1.0 Safari/535.8+
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 2.1.0; xx) AppleWebKit/536.2+ (KHTML like Gecko) Version/7.2.1.0 Safari/536.2+
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 2.1.0; xx) AppleWebKit/536.2+ (KHTML, like Gecko) Version/7.2.1.0 Safari/536.2+
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 2.1.0; xx) AppleWebKit/536.2+ (KHTML, like Gecko) Version/7.2.1.0 Safari/536.2+ BMID/E67A4753F6
Mozilla/5.0 (PlayBook; U; RIM Tablet OS 3.0.1; xx) AppleWebKit/536.2+ (KHTML, like Gecko) Version/7.2.1.0 Safari/536.2+
Mozilla/5.0 (RIM Tablet OS 2.1.0.1917; U) AppleWebKit/537.36 (KHTML, like Gecko) Safari/537.36
MQQBrowser/2.7 Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.0.1.30) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
MQQBrowser/2.7 Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.1.0.131) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
MQQBrowser/2.7 Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.1.0.147) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
MQQBrowser/3.2/Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.1.0.147) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
MQQBrowser/5.0/Mozilla/5.0 (PlayBook; U; Android 2.3.3; xx; PlayBook Build/2.1.0.147) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
RIM Tablet OS 3.0