Some browsers include an identifier in the Useragent string which tells us the model of the device that is being used. Below is a list of 10 unique device identifiers collected by WhichBrowser.

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Asha230DualSIMNokiaAsha 230
Asha230SingleSIMNokiaAsha 230
Asha500DualSIMNokiaAsha 500
501NokiaAsha 501
501.1NokiaAsha 501
501.2NokiaAsha 501
501sNokiaAsha 501
502NokiaAsha 502
503NokiaAsha 503
503sNokiaAsha 503