Verifying subscriber information for device-based authentication

A computer-implemented method for associating subscriber information with a user account, the method comprising:

• receiving a request to register subscriber information with a user account used to access a network-accessible service;
• obtaining, from a user associated with the user account, a telephone number or a Mobile Station International Subscriber Directory Number (MSISDN);
• transmitting, to a telecommunication network, a query for network-derived information associated with the telephone number or the MSISDN;
• receiving, from the telecommunication network, a response based on the query that comprises a network-derived hardware identifier associated by the telecommunication network with the telephone number or the MSISDN;
• obtaining, from a mobile communication device associated with the user, a hardware identifier;
• comparing the network-derived hardware identifier with the obtained hardware identifier, to detect whether the network-derived hardware identifier and the obtained hardware identifier match;
• and
• associating, based on the comparing to detect the match, the telephone number or the MSISDN with the user account.