A computer device may include a processor configured to execute instructions, stored in a memory, to receive a request to add a second mobile telephone number (MTN) line to a user equipment (UE) device associated with a first MTN line, generate a graft instruction to graft the second MTN line to the first MTN line, and send the generated graft instruction to a provisioning system configured to provision services for the UE device. The processor may be further configured to designate the second MTN line as having a grafted status with respect to the first MTN line, the grafted status indicating that the second MTN line has been added to a subscriber profile of the first MTN line, and that the UE device is configured to send and receive communications using the first MTN line and/or the second MTN line.