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 44 unique useragent strings from mobile devices collected by WhichBrowser.

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Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.23 Mobile Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2482.0 Mobile Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2485.0 Mobile Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2486.0 Mobile Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2489.0 Mobile Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2495.0 Mobile Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2497.0 Mobile Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2510.0 Mobile Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2580.0 Mobile Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2619 Mobile Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2624 Mobile Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2625 Mobile Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2631 Mobile Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2632 Mobile Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2635 Mobile Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2639 Mobile Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Tablet) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.23 Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Tablet) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2478.0 Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Tablet) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2481.0 Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Tablet) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2482.0 Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Tablet) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2483.0 Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Tablet) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2489.0 Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Tablet) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2495.0 Safari/537.36
Mozilla/5.0 (Linux; Jolla; Sailfish; Android 4.4; Tablet) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2510.0 Safari/537.36
Mozilla/5.0 (Linux; U; Jolla; Sailfish; Mobile; rv:20.0) Gecko/20.0 Firefox/20.0 Sailfish Browser/1.0 like Safari/535.19
Mozilla/5.0 (Linux; U; Jolla; Sailfish; Mobile; rv:20.0) Gecko/20.0 Firefox/20.0 Sailfish Browser/1.0 Mobile
Mozilla/5.0 (Maemo; Linux; Jolla; Sailfish; Mobile) AppleWebKit/534.13 (KHTML, like Gecko) NokiaBrowser/8.5.0 Mobile Safari/534.13
Mozilla/5.0 (Maemo; Linux; U; Jolla; Sailfish; Android) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2366.0 Mobile Safari/537.36
Mozilla/5.0 (Maemo; Linux; U; Jolla; Sailfish; Android) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2369.0 Mobile Safari/537.36
Mozilla/5.0 (Maemo; Linux; U; Jolla; Sailfish; Android) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2391.0 Mobile Safari/537.36
Mozilla/5.0 (Maemo; Linux; U; Jolla; Sailfish; Android) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2393.0 Mobile Safari/537.36
Mozilla/5.0 (Maemo; Linux; U; Jolla; Sailfish; Android) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2395.0 Mobile Safari/537.36
Mozilla/5.0 (Maemo; Linux; U; Jolla; Sailfish; Android) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.13 Mobile Safari/537.36
Mozilla/5.0 (Maemo; Linux; U; Jolla; Sailfish; Android) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.9 Mobile Safari/537.36
Mozilla/5.0 (Maemo; Linux; U; Jolla; Sailfish; like Android 4.3) AppleWebKit/538.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/538.1
Mozilla/5.0 (Maemo; Linux; U; Jolla; Sailfish; like Android) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.19 Mobile Safari/537.36
Mozilla/5.0 (Maemo; Linux; U; Jolla; Sailfish; like Android) AppleWebKit/538.1 (KHTML, like Gecko) Mobile Safari/538.1 (compatible)
Mozilla/5.0 (Maemo; Linux; U; Jolla; Sailfish; like Android, Mobile) AppleWebKit/538.1 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/538.1
Mozilla/5.0 (Maemo; Linux; U; Jolla; Sailfish; Mobile; rv:26.0) Gecko/26.0 Firefox/26.0 SailfishBrowser/1.0 like Safari/538.1
Mozilla/5.0 (Maemo; Linux; U; Jolla; Sailfish; Mobile; rv:29.0) Gecko/29.0 Firefox/29.0 SailfishBrowser/1.0
Mozilla/5.0 (Maemo; Linux; U; Jolla; Sailfish; Mobile; rv:31.0) Gecko/31.0 Firefox/31.0 SailfishBrowser/1.0
Mozilla/5.0 (Maemo; Linux; U; Jolla; Sailfish; Mobile; rv:38.0) Gecko/38.0 Firefox/38.0 SailfishBrowser/1.0
Mozilla/5.0 (Maemo; Linuz; U; Jolla; Sailfish; Mobile; rv:26.0) Gecko/26.0 Firefox/26.0 SailfishBrowser/1.0 like Safari/538.1
Mozilla/5.0 (U; X11; Linux; Maemo; Jolla; Sailfish; like Android 4.3) AppleWebKit/538.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/538.1