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 42 unique useragent strings from mobile devices collected by WhichBrowser.

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Mozilla/1.22 (compatible; MSIE 5.01; PalmOS 3.0) EudoraWeb 2
Mozilla/1.22 (compatible; MSIE 5.01; PalmOS 3.0) EudoraWeb 2.1
Mozilla/4.0 (compatible; MSIE 6.0; Windows 95; PalmSource) NetFront/3.0
Mozilla/4.0 (compatible; MSIE 6.0; Windows 95; PalmSource; Blazer 3.0) 16;160x160
Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; PalmSource/hspr-H102; Blazer/4.0) 16;320x320
Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; PalmSource/hspr-H102; Blazer/4.2) 16;320x320
Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; PalmSource/Palm-D050; Blazer/4.3) 16;320x320
Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; PalmSource/Palm-D050; Blazer/4.3) 16;320x448
Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; PalmSource/Palm-D050; Blazer/4.3) 16;448x320
Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; PalmSource/Palm-D052; Blazer/4.5) 16;320x320
Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; PalmSource/Palm-D060; Blazer/4.5) 16;320x320
Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; PalmSource/Palm-D062; Blazer/4.5) 16;320x320
Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; PalmSource/Palm-TunX; Blazer/4.3) 16;320x320
Mozilla/4.0 (compatible; MSIE 6.666; Palm OS 5; .NET CLR 1.1.4322)
Mozilla/4.0 (PDA; PalmOS/sony/model crdb/Revision:1.1.19) NetFront/3.0
Mozilla/4.0 (PDA; PalmOS/sony/model crdb/Revision:1.1.36) NetFront/3.0
Mozilla/4.0 (PDA; PalmOS/sony/model grnd/Revision:1.1.30(en)) NetFront/3.0
Mozilla/4.0 (PDA; PalmOS/sony/model mdrd/Revision:1.1.47) NetFront/3.0
Mozilla/4.0 (PDA; PalmOS/sony/model prmr/Revision:1.1.54 (en)) NetFront/3.0
Mozilla/4.0 (PDA; PalmOS/sony/model prmr/Revision:1.1.54) NetFront/3.0
Mozilla/4.0 (PDA; PalmOS/sony/model prmr/Revision:1.1.55 (de)) NetFront/3.0
Mozilla/4.08 (PDA; PalmOS/****/model ****/Revision:2.0.22 (en)) NetFront/3.1
Mozilla/4.08 (PDA; PalmOS/palm/model MT64/Revision:2.0.34 (en)) NetFront/3.1
Mozilla/4.08 (PDA; PalmOS/sony/model atom/Revision:2.0.22 (en)) NetFront/3.1
Mozilla/4.08 (PDA; PalmOS/sony/model atom/Revision:2.0.22) NetFront/3.1
Mozilla/4.08 (PDA; PalmOS/sony/model atom/Revision:2.0.26 (de)) NetFront/3.1
Mozilla/4.08 (PDA; PalmOS/sony/model atom/Revision:2.0.26 (en)) NetFront/3.1
Mozilla/4.08 (PDA; PalmOS/sony/model luke/Revision:2.0.22 (en)) NetFront/3.1
Mozilla/4.08 (PDA; PalmOS/sony/model prmr/Revision:2.0.22 (en)) NetFront/3.1
Mozilla/4.08 (PDA; PalmOS/sony/model tldo/Revision:2.0.22 (en)) NetFront/3.1
Mozilla/4.76 (compatible; MSIE 6.0; U; Windows 95; PalmSource; PalmOS; WebPro; Tungsten Proxyless 1.1 320x320x16)
Mozilla/4.76 [en] (PalmOS; U; WbePro/3.0; Palm-Arz1)
Mozilla/4.76 [en] (PalmOS; U; WebPro3.0; Palm-Arz1)
Palm680/RC1 Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; PalmSource/Palm-D053; Blazer/4.5) 16;320x320
Palm680/RC1 Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; PalmSource/Palm-D053; Blazer/4.5) 16;320x320 UP.Link/6.3.0.0.0
PalmCentro/v0001 Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; PalmSource/Palm-D061; Blazer/4.5) 16;320x320
Palmscape/3.0J [ja] (v. 3.5.2H1.5; 153x130; c8)
Xiino/1.0.1SJ [ja] (v. 4.1; 153x130; c8/d; PSCruiser1.0)
Xiino/2.1.2J [ja] (v. 4.0.1; 153x130; g4)
Xiino/2.1.2J [ja] (v. 4.1; 153x130; c16)
Xiino/2.1J [ja] (v. 3.5.2H1.5; 153x130; g4)
Xiino/2.1J [ja] (v. 4.1; 153x130; c16)