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 90 unique useragent strings from mobile devices collected by WhichBrowser.

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Opera/9.80 (VRE; Opera Mini/4.2/28.2794; U; en) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/28.3030; U; xx) Presto/2.8.119 Version/11.10sion/11.1010
Opera/9.80 (VRE; Opera Mini/4.2/28.3492; U; xx) Presto/2.8.119 Version/11.10/11.10/11.10
Opera/9.80 (VRE; Opera Mini/4.2/28.3492; U; xx) Presto/2.8.119 Version/11.10ersion/11.10
Opera/9.80 (VRE; Opera Mini/4.2/28.3492; U; xx) Presto/2.8.119 Version/11.10sion/11.10
Opera/9.80 (VRE; Opera Mini/4.2/28.3821; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/28.3821; U; xx) Presto/2.8.119 Version/11.10ersion/11.1001.10
Opera/9.80 (VRE; Opera Mini/4.2/30.3442; U; xx) Presto/2.8.119 Version/11.10ersion/11.10
Opera/9.80 (VRE; Opera Mini/4.2/30.3498; U; xx) Presto/2.8.119 Version/11.10ersion/11.10
Opera/9.80 (VRE; Opera Mini/4.2/30.3498; U; xx) Presto/2.8.119 Version/11.10ersion/11.10.119 Version
Opera/9.80 (VRE; Opera Mini/4.2/30.3498; U; xx) Presto/2.8.119 Version/11.10sion/11.10
Opera/9.80 (VRE; Opera Mini/4.2/30.3498; U; xx) Presto/2.8.119 Version/11.10sion/11.1010
Opera/9.80 (VRE; Opera Mini/4.2/30.3498; U; xx) Presto/2.8.119 Version/11.10Version/11.1010
Opera/9.80 (VRE; Opera Mini/4.2/30.3526; U; xx) Presto/2.8.119 Version/11.10ersion/11.10
Opera/9.80 (VRE; Opera Mini/4.2/30.3558; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/30.3558; U; xx) Presto/2.8.119 Version/11.10 Presto/2.8.119 Version/
Opera/9.80 (VRE; Opera Mini/4.2/30.3558; U; xx) Presto/2.8.119 Version/11.10/11.10/11.10
Opera/9.80 (VRE; Opera Mini/4.2/30.3558; U; xx) Presto/2.8.119 Version/11.10d/1.0 Opera/9.80 (J2ME/M
Opera/9.80 (VRE; Opera Mini/4.2/30.3558; U; xx) Presto/2.8.119 Version/11.10ersion/11.10
Opera/9.80 (VRE; Opera Mini/4.2/30.3558; U; xx) Presto/2.8.119 Version/11.10ersion/11.100
Opera/9.80 (VRE; Opera Mini/4.2/30.3558; U; xx) Presto/2.8.119 Version/11.10ersion/11.10119 Version/
Opera/9.80 (VRE; Opera Mini/4.2/30.3558; U; xx) Presto/2.8.119 Version/11.10sion/11.10
Opera/9.80 (VRE; Opera Mini/4.2/30.3558; U; xx) Presto/2.8.119 Version/11.10sion/11.10109.80 (J2ME/M
Opera/9.80 (VRE; Opera Mini/4.2/30.3558; U; xx) Presto/2.8.119 Version/11.10sion/11.10a/9.80 (J2ME/M
Opera/9.80 (VRE; Opera Mini/4.2/30.3593; U; xx) Presto/2.8.119 Version/11.10ersion/11.10
Opera/9.80 (VRE; Opera Mini/4.2/30.3793; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/31.1350; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/31.1350; U; xx) Presto/2.8.119 Version/11.10sion/11.10100
Opera/9.80 (VRE; Opera Mini/4.2/31.1543; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/31.1543; U; xx) Presto/2.8.119 Version/11.10ersion/11.10
Opera/9.80 (VRE; Opera Mini/4.2/32.1312; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/32.1312; U; xx) Presto/2.8.119 Version/11.10ersion/11.10
Opera/9.80 (VRE; Opera Mini/4.2/32.1312; U; xx) Presto/2.8.119 Version/11.10sion/11.10
Opera/9.80 (VRE; Opera Mini/4.2/32.1440; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/34.1016; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/34.1016; U; xx) Presto/2.8.119 Version/11.10ersion/11.10
Opera/9.80 (VRE; Opera Mini/4.2/34.1016; U; xx) Presto/2.8.119 Version/11.10sion/11.10
Opera/9.80 (VRE; Opera Mini/4.2/34.1309; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/34.1309; U; xx) Presto/2.8.119 Version/11.10ersion/11.10
Opera/9.80 (VRE; Opera Mini/4.2/34.1309; U; xx) Presto/2.8.119 Version/11.10sion/11.1010
Opera/9.80 (VRE; Opera Mini/4.2/34.1338; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/34.1394; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/34.1425; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/34.1445; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/34.1499; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/34.1526; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/34.1576; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/34.1784; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/34.1784; U; xx) Presto/2.8.119 Version/11.10ersion/11.10.10
Opera/9.80 (VRE; Opera Mini/4.2/34.804; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/34.818; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.3312; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.3459; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.3527; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.3527; U; xx) Presto/2.8.119 Version/11.10sion/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.3666; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.4131; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.4183; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.4295; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.4774; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.4816; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.4816; U; xx) Presto/2.8.119 Version/11.10ersion/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.4851; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.5390; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.5858; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.6050; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.6172; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.6311; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.6368; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.6497; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.6680; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.7194; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/35.7382; U; xx) Presto/2.8.119 Version/11.10
Opera/9.80 (VRE; Opera Mini/4.2/36.1867; U; xx) Presto/2.12.423 Version/12.16
Opera/9.80 (VRE; Opera Mini/4.2/36.2084; U; xx) Presto/2.12.423 Version/12.16
Opera/9.80 (VRE; Opera Mini/4.2/36.2161; U; xx) Presto/2.12.423 Version/12.16
Opera/9.80 (VRE; Opera Mini/4.2/36.2381; U; xx) Presto/2.12.423 Version/12.16
Opera/9.80 (VRE; Opera Mini/4.2/37.6116; U; xx) Presto/2.12.423 Version/12.16
Opera/9.80 (VRE; Opera Mini/4.2/37.6334; U; xx) Presto/2.12.423 Version/12.16
Opera/9.80 (VRE; Opera Mini/4.2/37.6488; U; xx) Presto/2.12.423 Version/12.16
Opera/9.80 (VRE; Opera Mini/4.2/37.6584; U; xx) Presto/2.12.423 Version/12.16
Opera/9.80 (VRE; Opera Mini/4.2/37.6711; U; xx) Presto/2.12.423 Version/12.16
Opera/9.80 (VRE; Opera Mini/4.2/37.7011; U; xx) Presto/2.12.423 Version/12.16
Opera/9.80 (VRE; Opera Mini/4.2/37.7148; U; xx) Presto/2.12.423 Version/12.16
Opera/9.80 (VRE; Opera Mini/4.2/37.7327; U; xx) Presto/2.12.423 Version/12.16
Opera/9.80 (VRE; Opera Mini/4.2/37.7465; U; xx) Presto/2.12.423 Version/12.16
Opera/9.80 (VRE; Opera Mini/4.2/37.7549; U; xx) Presto/2.12.423 Version/12.16
Opera/9.80 (VRE; Opera Mini/4.2/37.7617; U; xx) Presto/2.12.423 Version/12.16
Opera/9.80 (VRE; Opera Mini/4.2/37.7751; U; xx) Presto/2.12.423 Version/12.16
Opera/9.80 (VRE; Opera Mini/4.2/37.7758; U; xx) Presto/2.12.423 Version/12.16