Embodiments of the invention provide methods and apparatus for providing one-telephone dialing number telephony services where only a single telephone dialing number is required for each subscriber, despite each subscriber having multiple telephony devices on which they wish to be contacted. Calls to a one-telephone dialing number telephony service subscriber may be detected at a telephone switch using one or more triggers configured in association with a device-shared telephone dialing number allocated to the subscriber. Upon receipt of a call connection request to a subscriber, control of the call is assumed, for example by redirecting the call to a service platform capable of generating multiple call connection requests. Multiple outgoing call connection requests are transmitted to multiple telephony devices, including a mobile telephone, associated with the device-shared telephone dialing number allocated to a subscriber.