An in-progress call can be manipulated such that user devices in proximity to the in-progress call, but not initially part of the call, are enabled to join the in-progress call. Determining that a user device is in proximity to an in-progress call may include detection, by the user device, of an in-progress call. Alternatively, or in addition, a communication device involved in the in-progress call may detect a user device and query the user device as to whether it has permissions to join the in-progress call and, if so, whether it wants to join the in-progress call.