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 201 unique useragent strings from mobile devices collected by WhichBrowser.

		
Mozilla/5.0  (Mobile; rv:13.0) Gecko/13.0 Firefox/13.0
Mozilla/5.0 (0; U; Mobile; rv:18.1) MyWebkit/537.51.1; U; (KHTML, like Gecko) Gecko/18.1;Firefox/18.1 Mobile Safari/537.51.1; U; Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_9_1; en-I'D) MyWebKit/537.51.1 (KHTML, like Gecko) Chrome/34.0.1788.0 OPR/20.0.1
Mozilla/5.0 (4.2.2; Samsung Galaxy S II; rv:22.0) Gecko/25.0 Firefox/25.0
Mozilla/5.0 (4.2.2; Samsung Galaxy S2; rv:22.0) Gecko/22.0 Firefox/25.0
Mozilla/5.0 (FreeBSD; Viera; rv:34.0) Gecko/20100101 Firefox/34.0
Mozilla/5.0 (FreeBSD; Viera; rv:43.0) Gecko/20100101 Firefox/43.0
Mozilla/5.0 (FreeBSD; Viera; rv:44.0) Gecko/20100101 Firefox/44.0
Mozilla/5.0 (Mobile; A0001; rv:44.0) Gecko/44.0 Firefox/44.0
Mozilla/5.0 (Mobile; A29F Build; rv:18.0) Gecko/18.0 Firefox/18.0
Mozilla/5.0 (Mobile; ALCATEL ONE TOUCH 4012A; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; ALCATEL ONE TOUCH 4012A; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATEL ONE TOUCH 4012X; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; ALCATELOneTouch4012A; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; ALCATELOneTouch4012A; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4012X SVN:01013S MMS:1.1; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4012X SVN:01015B MMS:1.1; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4012X SVN:01015G MMS:1.1; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4012X SVN:01017P MMS:1.1; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4012X/SVN 01010B; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; ALCATELOneTouch4012X/SVN 01011S; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; ALCATELOneTouch4012X/SVN 01012G; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; ALCATELOneTouch4012X/SVN 01012P; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; ALCATELOneTouch4012X/SVN 01013B; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; ALCATELOneTouch4012X/SVN 01014G; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; ALCATELOneTouch4012X/SVN 01014P; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; ALCATELOneTouch4012X; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; ALCATELOneTouch4012X; rv:43.0) Gecko/43.0 Firefox/43.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4019A; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4019X SVN:02005G MMS:1.1; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4019X SVN:02006G MMS:1.1; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4019X SVN:02008G MMS:1.1; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4019X SVN:02009G MMS:1.1; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4019X SVN:02010G MMS:1.1; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4019X SVN:02010S MMS:1.1; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4019X/SVN 02003G; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4019X/SVN 02004G; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4019X; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4020D; rv:28.1) Gecko/28.1 Firefox/28.1
Mozilla/5.0 (Mobile; ALCATELOneTouch4022D; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4023A; rv:18.0) Gecko/18.0 Firefox/18.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4023A; rv:29.0) Gecko/29.0 Firefox/29.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4023A; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4023X; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; ALCATELOneTouch4024A; rv:43.0) Gecko/43.0 Firefox/43.0
Mozilla/5.0 (Mobile; ALCATELOneTouch5040X; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; ALCATELOneTouch6015X SVN:01002D MMS:1.1; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch6015X SVN:01004B MMS:1.1; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch6015X SVN:01004D MMS:1.1; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch6015X SVN:01006B MMS:1.1; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch6015X SVN:01006D MMS:1.1; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch6015X SVN:01007B MMS:1.1; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; ALCATELOneTouch6015X SVN:01007G MMS:1.1; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; ALCATELOneTouch6015X; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; ALCATELOneTouch6015X; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; HUAWEI Ascend Y300-F1; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; HUAWEIY300-F1; rv:18.0) Gecko/18.0 Firefox/18.0
Mozilla/5.0 (Mobile; HUAWEIY300-F1; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; LG-D300; rv:18.0) Gecko/18.0 Firefox/18.0
Mozilla/5.0 (Mobile; LG-D300; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; LG-D301; rv:26.0) Gecko/26.0 Firefox/26.0
Mozilla/5.0 (Mobile; LGL25; rv:18.0) Gecko/18.0 Firefox/18.0
Mozilla/5.0 (Mobile; LGL25; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; madai; rv:18.0) Gecko/18.0 Firefox/18.0
Mozilla/5.0 (Mobile; madai; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; madai; rv:30.0) Gecko/30.0 Firefox/30.0
Mozilla/5.0 (Mobile; madai; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; madai; rv:33.0) Gecko/33.0 Firefox/33.0
Mozilla/5.0 (Mobile; OneTouch4019A; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; OneTouch6015X SVN:01008B MMS:1.1; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; OneTouch6015X SVN:01008S MMS:1.1; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; OneTouch6015X SVN:01009B MMS:1.1; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; OneTouch6015X SVN:01010B MMS:1.1; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; OneTouch6015X SVN:01010G MMS:1.1; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; OneTouch6015X; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; Open C; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; OPEN2; rv:18.0) Gecko/18.0 Firefox/18.0
Mozilla/5.0 (Mobile; OPEN2; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; OPEN2; rv:18.2) Gecko/18.2 Firefox/18.2
Mozilla/5.0 (Mobile; OPEN2; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; OPEN2; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; OPEN; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; OPENC2; rv:18.0) Gecko/18.0 Firefox/18.0
Mozilla/5.0 (Mobile; OPENC2; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; OPENC2; rv:30.0) Gecko/30.0 Firefox/30.0
Mozilla/5.0 (Mobile; OPENC2; rv:34.0) Gecko/34.0 Firefox/34.0
Mozilla/5.0 (Mobile; OPENC2; rv:37.0) Gecko/37.0 Firefox/37.0
Mozilla/5.0 (Mobile; OPENC; rv:17.0) Gecko/17.0 Firefox/17.0
Mozilla/5.0 (Mobile; OPENC; rv:18.0) Gecko/18.0 Firefox/18.0
Mozilla/5.0 (Mobile; OPENC; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; OPENC; rv:19.0) Gecko/19.0 Firefox/19.0
Mozilla/5.0 (Mobile; OPENC; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; OPENC; rv:29.0) Gecko/29.0 Firefox/29.0
Mozilla/5.0 (Mobile; OPENC; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; OPENC; rv:33.0) Gecko/33.0 Firefox/33.0
Mozilla/5.0 (Mobile; OPENC; rv:34.0) Gecko/34.0 Firefox/34.0
Mozilla/5.0 (Mobile; OPENC; rv:35.0) Gecko/35.0 Firefox/35.0
Mozilla/5.0 (Mobile; OPENC; rv:36.0) Gecko/36.0 Firefox/36.0
Mozilla/5.0 (Mobile; OPENC; rv:37.0) Gecko/37.0 Firefox/37.0
Mozilla/5.0 (Mobile; OPENC; rv:38.0) Gecko/38.0 Firefox/38.0
Mozilla/5.0 (Mobile; OPENC; rv:40.0) Gecko/40.0 Firefox/40.0
Mozilla/5.0 (Mobile; OPENC; rv:42.0) Gecko/42.0 Firefox/42.0
Mozilla/5.0 (Mobile; OPENC; rv:44.0) Gecko/44.0 Firefox/44.0
Mozilla/5.0 (Mobile; OPENC; rv:45.0) Gecko/45.0 Firefox/45.0
Mozilla/5.0 (Mobile; Orange KLIF; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; Orange KLIFD; rv:18.0) Gecko/18.0 Firefox/18.0
Mozilla/5.0 (Mobile; Orange KLIFD; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; rv32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; rv:12.0) Gecko/12.0 Firefox/12.0
Mozilla/5.0 (Mobile; rv:13.0) Gecko/13.0 Firefox/13.0
Mozilla/5.0 (Mobile; rv:15.0) Gecko/15.0 Firefox/15.0
Mozilla/5.0 (Mobile; rv:17.0) Gecko/17.0 Firefox/17.0
Mozilla/5.0 (Mobile; rv:18.0) Gecko/18.0 Firefox/18.0
Mozilla/5.0 (Mobile; rv:18.0) Gecko/20130123 Firefox/18.0
Mozilla/5.0 (Mobile; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Mobile; rv:18.1) Gecko/20130624 Firefox/18.1
Mozilla/5.0 (Mobile; rv:19.0) Gecko/19.0 Firefox/19.0
Mozilla/5.0 (Mobile; rv:20.0) Gecko/20.0 Firefox/20.0
Mozilla/5.0 (Mobile; rv:21.0) Gecko/20130119 Firefox/21.0
Mozilla/5.0 (Mobile; rv:21.0) Gecko/20130122 Firefox/21.0
Mozilla/5.0 (Mobile; rv:21.0) Gecko/20130128 Firefox/21.0
Mozilla/5.0 (Mobile; rv:21.0) Gecko/20130210 Firefox/21.0
Mozilla/5.0 (Mobile; rv:21.0) Gecko/20130219 Firefox/21.0
Mozilla/5.0 (Mobile; rv:21.0) Gecko/21.0 Firefox/21.0
Mozilla/5.0 (Mobile; rv:22.0) Gecko/20130220 Firefox/22.0
Mozilla/5.0 (Mobile; rv:22.0) Gecko/20130222 Firefox/22.0
Mozilla/5.0 (Mobile; rv:22.0) Gecko/20130225 Firefox/22.0
Mozilla/5.0 (Mobile; rv:22.0) Gecko/20130302 Firefox/22.0
Mozilla/5.0 (Mobile; rv:22.0) Gecko/22.0 Firefox/22.0
Mozilla/5.0 (Mobile; rv:24.0) Gecko/24.0 Firefox/24.0
Mozilla/5.0 (Mobile; rv:25.0) Gecko/20130701 Firefox/25.0
Mozilla/5.0 (Mobile; rv:25.0) Gecko/20130713 Firefox/25.0
Mozilla/5.0 (Mobile; rv:25.0) Gecko/20130718 Firefox/25.0
Mozilla/5.0 (Mobile; rv:25.0) Gecko/20130723 Firefox/25.0
Mozilla/5.0 (Mobile; rv:25.0) Gecko/25.0 Firefox/25.0
Mozilla/5.0 (Mobile; rv:26.0) Gecko/11.0 Firefox/26.0
Mozilla/5.0 (Mobile; rv:26.0) Gecko/18.0 Firefox/26.0
Mozilla/5.0 (Mobile; rv:26.0) Gecko/18.1 Firefox/26.0
Mozilla/5.0 (Mobile; rv:26.0) Gecko/20100101 Firefox/26.0
Mozilla/5.0 (Mobile; rv:26.0) Gecko/26.0 Firefox/26.0
Mozilla/5.0 (Mobile; rv:26.0) Gecko/28.0 Firefox/26.0
Mozilla/5.0 (Mobile; rv:26.0) Gecko/30.0 Firefox/26.0
Mozilla/5.0 (Mobile; rv:26.0) Gecko/32.0 Firefox/26.0
Mozilla/5.0 (Mobile; rv:26.0) Gecko/34.0 Firefox/26.0
Mozilla/5.0 (Mobile; rv:27.0) Gecko/20100101 Firefox/27.0
Mozilla/5.0 (Mobile; rv:27.0) Gecko/27.0 Firefox/27.0
Mozilla/5.0 (Mobile; rv:28.0) Gecko/20100101 Firefox/28.0
Mozilla/5.0 (Mobile; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Mobile; rv:28.1) Gecko/28.1 Firefox/28.1
Mozilla/5.0 (Mobile; rv:29.0) Gecko/20100101 Firefox/29.0
Mozilla/5.0 (Mobile; rv:29.0) Gecko/29.0 Firefox/29.0
Mozilla/5.0 (Mobile; rv:30.0) Gecko/20100101 Firefox/30.0
Mozilla/5.0 (Mobile; rv:30.0) Gecko/30.0 Firefox/30.0
Mozilla/5.0 (Mobile; rv:31.0) Gecko/20100101 Firefox/31.0
Mozilla/5.0 (Mobile; rv:31.0) Gecko/31.0 Firefox/31.0
Mozilla/5.0 (Mobile; rv:32.0) Gecko/20100101 Firefox/32.0
Mozilla/5.0 (Mobile; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Mobile; rv:33.0) Gecko/20100101 Firefox/33.0
Mozilla/5.0 (Mobile; rv:33.0) Gecko/33.0 Firefox/33.0
Mozilla/5.0 (Mobile; rv:34.0) Gecko/20100101 Firefox/34.0
Mozilla/5.0 (Mobile; rv:34.0) Gecko/34.0 Firefox/34.0
Mozilla/5.0 (Mobile; rv:35.0) Gecko/20100101 Firefox/35.0
Mozilla/5.0 (Mobile; rv:35.0) Gecko/35.0 Firefox/35.0
Mozilla/5.0 (Mobile; rv:36.0) Gecko/20100101 Firefox/36.0
Mozilla/5.0 (Mobile; rv:36.0) Gecko/36.0 Firefox/36.0
Mozilla/5.0 (Mobile; rv:37.0) Gecko/20100101 Firefox/37.0
Mozilla/5.0 (Mobile; rv:37.0) Gecko/37.0 Firefox/37.0
Mozilla/5.0 (Mobile; rv:38.0) Gecko/20100101 Firefox/38.0
Mozilla/5.0 (Mobile; rv:38.0) Gecko/38.0 Firefox/38.0
Mozilla/5.0 (Mobile; rv:39.0) Gecko/20100101 Firefox/39.0
Mozilla/5.0 (Mobile; rv:39.0) Gecko/39.0 Firefox/39.0
Mozilla/5.0 (Mobile; rv:40.0) Gecko/20100101 Firefox/40.0
Mozilla/5.0 (Mobile; rv:40.0) Gecko/40.0 Firefox/40.0
Mozilla/5.0 (Mobile; rv:41.0) Gecko/20100101 Firefox/41.0
Mozilla/5.0 (Mobile; rv:41.0) Gecko/41.0 Firefox/41.0
Mozilla/5.0 (Mobile; rv:42.0) Gecko/20100101 Firefox/42.0
Mozilla/5.0 (Mobile; rv:42.0) Gecko/42.0 Firefox/42.0
Mozilla/5.0 (Mobile; rv:42.0.1) Gecko/42.0.1 Firefox/42.0.1
Mozilla/5.0 (Mobile; rv:43.0) Gecko/20100101 Firefox/43.0
Mozilla/5.0 (Mobile; rv:43.0) Gecko/43.0 Firefox/43.0
Mozilla/5.0 (Mobile; rv:44.0) Gecko/44.0 Firefox/44.0
Mozilla/5.0 (Mobile; rv:45.0) Gecko/45.0 Firefox/45.0
Mozilla/5.0 (Mobile; rv:46.0) Gecko/46.0 Firefox/46.0
Mozilla/5.0 (Mobile; rv:47.0) Gecko/47.0 Firefox/47.0
Mozilla/5.0 (Mobile; ZTEOPEN; rv:18.1) Gecko/18.1 Firefox/18.1
Mozilla/5.0 (Tablet; rv:12.0) Firefox/12.0
Mozilla/5.0 (Tablet; rv:28.0) Gecko/28.0 Firefox/28.0
Mozilla/5.0 (Tablet; rv:29.0) Gecko/29.0 Firefox/29.0
Mozilla/5.0 (Tablet; rv:30.0) Gecko/30.0 Firefox/30.0
Mozilla/5.0 (Tablet; rv:31.0) Gecko/31.0 Firefox/31.0
Mozilla/5.0 (Tablet; rv:32.0) Gecko/32.0 Firefox/32.0
Mozilla/5.0 (Tablet; rv:33.0) Gecko/33.0 Firefox/33.0
Mozilla/5.0 (Tablet; rv:34.0) Gecko/34.0 Firefox/34.0
Mozilla/5.0 (Tablet; rv:35.0) Gecko/35.0 Firefox/35.0
Mozilla/5.0 (Tablet; rv:36.0) Gecko/36.0 Firefox/36.0
Mozilla/5.0 (Tablet; rv:37.0) Gecko/37.0 Firefox/37.0
Mozilla/5.0 (Tablet; rv:39.0) Gecko/39.0 Firefox/39.0
Mozilla/5.0 (Tablet; rv:40.0) Gecko/40.0 Firefox/40.0
Mozilla/5.0 (Tablet; rv:45.0) Gecko/45.0 Firefox/45.0
Mozilla/5.0 (Tablet; rv:46.0) Gecko/46.0 Firefox/46.0
Mozilla/5.0 (Ubuntu like Android; Mobile; rv:13.0) Gecko/13.0 Firefox/13.0
Mozilla/5.0 (蓝翔; Mobile; rv:14.0) Gecko/14.0 Firefox/14.0