Method, device and system for obtaining user identity identifier

The embodiment of the invention discloses a method for obtaining a user identity identifier, which comprises the steps as follows: a terminal provided with a user identification module receives a user identity request; the terminal provided with the user identification module is served as a card terminal; the card terminal generates a user identity identifier corresponding to the user identity request, and transmits the user identity identifier. The embodiment can provide the user identity identifier to a card-less terminal, so as to save the resource of SIM (subscriber identify module) cards. The embodiment of the invention also discloses a device and a system employing the method.