Abstract: A method and system is disclosed for facilitating voice mailbox operations for a mobile phone capable of operating in both a CDMA and a GSM environment. The system has at least first and second switching points and a global switching point in communication with a control point. Upon a first switching point detecting a busy/no answer condition for a request to terminate a call to a called station (the call originating from a calling station), the first switching point forwards the terminating call to a temporary, unique forward-to number belonging to the global switching point which then sends at least one message to the control point, the at least one message identifying the unique forward-to number designating a voice mailbox. The control point then identifies the second switching point from the unique forward-to number and sends a first call treatment message instructing the second switching point to apply voicemail treatment at a voice mailbox linked thereto.