In a network comprising call handling services for mobile users, services being requested by the mobile user for an active call and wherein each user registers for services with a personal identification number (PIN), a method for updating said personal identification number during an active call, the steps of said method comprising: registering user initially with the network for services with user's personal identification number during an active call; signalling a user preference to update the personal identification number; and updating user's personal identification number during said active call. In another aspect, a network comprising a plurality of servers connecting with mobile users requesting call services, wherein said users register with one of said servers with a private user mobility wherein further each said user has an associated home server and may request services at said home server or other visitor servers; a method for user registration, the steps of said method comprising: entering an alternative identifier instead of said private user mobility number at a server; mapping said alternative identifier to a number representing said user's home server; returning either a rejected or accepted result with said home server.
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