System and gateway system for managing phone numbers and user IDs
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In a service providing server, a transfer/re-assignment detection section detects that a transfer or re-assignment has occurred from information notified from a customer information management apparatus, and in response to this, a user ID creation section creates a user ID to identify a new user. A contract information management section stores the user information containing the user ID in correspondence with the phone number and a service component acquires the user ID corresponding to the phone number of the mobile phone with reference to the user information.