A network-based service is utilized to facilitate twinning of two or more communication devices associated with a subscriber account. Incoming communication is intercepted by a communication device and forwarded to a network server, which in turn transmits the incoming communication to the multiple twinned devices. In addition, identifier data associated with outgoing communication is replaced with a primary identifier (e.g., customer telephone number (CTN)) of a user's primary device or a common identifier (e.g., a mobile one number (MON)) assigned to devices associated with the user's subscriber account. Communication devices can be temporarily twinned for a defined time period, during which a common bill can be generated for the twinned devices.