A method enabling a telecommunications terminal to access a database hosted by a service platform that can be accessed via a telecommunications network. The method includes: transmitting, to a second terminal associated with a mobile identifier of a second telecommunications network, information representing a request for the first terminal to access the database; in the second terminal, sending a response to the access request to an authentication server of the platform; in the authentication server, when a response to the access request is received, verifying the mobile identifier of the second network, and optionally validating the access of the first terminal to the database depending on the outcome of the verification.