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 1 unique useragent strings from mobile devices collected by WhichBrowser.

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Mozilla/5.0 (Linux; U; Grid OS 1.0; xx) AppleWebKit/533.1 (KHTML, like Gecko) Version/5.0 Safari/533.1