An approach is provided for global multiline roaming. A global roaming multiline platform provisions a communication device with a plurality of communication access numbers respectively associated with a plurality of communication service regions, wherein the plurality of communication access numbers are associated with a single subscriber identity module (SIM) of the communication device. The platform also selects a target communication access number from among the plurality of communication access numbers for relaying a communication session to or from the communication device based on a location of the communication device, a location of a called device, a location of a calling device, or a combination thereof with respect to the plurality of communication service regions.