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 6 unique useragent strings from mobile devices collected by WhichBrowser.

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K-Touch U2/1.0 WoPhone/1.0 UPhone/1.0 Browser/UPhoneWebBrowser1.0 Profile/MIDP-1.0 Configuration/CLDC-1.0 Mozilla/5.0+(Linux;+U;+UPhone+TOPS+1.0UPhone+TOPS+1.0;+zh-cn;+Android+9.8)+AppleWebKit/532.9++UPhoneWebKit/532.9++(KHTML, like Gecko)+Mobile+Safari/
TCL A860/1.0 WoPhone/1.0 UPhone/1.0 Browser/UPhoneWebBrowser1.0 Profile/MIDP-1.0 Configuration/CLDC-1.0 Mozilla/5.0+(Linux;+U;+UPhone+TOPS+1.0UPhone+TOPS+1.0;+zh-cn;+Android+9.8)+AppleWebKit/532.9++UPhoneWebKit/532.9++(KHTML, like Gecko)+Mobile+Safari/53
TCL A990/1.0 WoPhone/1.0 UPhone/1.0 Browser/UPhoneWebBrowser1.0 Profile/MIDP-1.0 Configuration/CLDC-1.0 Mozilla/5.0+(Linux;+U;+UPhone+TOPS+1.0UPhone+TOPS+1.0;+zh-cn;+Android+9.8)+AppleWebKit/532.9++UPhoneWebKit/532.9++(KHTML, like Gecko)+Mobile+Safari/53
TCL Y900/1.0 WoPhone/1.0 UPhone/1.0 Browser/UPhoneWebBrowser1.0 Profile/MIDP-1.0 Configuration/CLDC-1.0 Mozilla/5.0+(Linux;+U;+UPhone+TOPS+1.0UPhone+TOPS+1.0;+zh-cn;+Android+9.8)+AppleWebKit/532.9++UPhoneWebKit/532.9++(KHTML, like Gecko)+Mobile+Safari/53
TCL_J720/1.0 WoPhone/1.0 UPhone/1.0 Browser/UPhoneWebBrowser1.0 Profile/MIDP-1.0 Configuration/CLDC-1.0 Mozilla/5.0+(Linux;+U;+UPhone+TOPS+1.0UPhone+TOPS+1.0;+zh-cn;+Android+9.8)+AppleWebKit/532.9++UPhoneWebKit/532.9++(KHTML, like Gecko)+Mobile+Safari/53
TOPS/1.0 WoPhone/1.0 UPhone/1.0 Browser/UPhoneWebBrowser1.0 Profile/MIDP-1.0 Configuration/CLDC-1.0 Mozilla/5.0+(Linux;+U;+UPhone+TOPS+1.0UPhone+TOPS+1.0;+zh-cn;+Android+9.8)+AppleWebKit/532.9++UPhoneWebKit/532.9++(KHTML, like Gecko)+Mobile+Safari/532.9+