An accessory device for a wireless telephone or handset functions as either a shoulder rest or a stand. The accessory device has a pair of attaching arms with a pair of attaching pins for attaching the device to the rear surface of a handset by inserting the attaching pins into openings on the handset. The attaching arms extend from a body of the device. A sliding arm slides through the body of the device in a continuous action to multiple configurations. When the sliding arm is fully extended to the bottom of the body, the device is in a configuration to operate as a stand. A foot at the bottom of the device provides support to the handset to hold it in a generally upright position. When the sliding arm is extended out the top of the body, the device is in a configuration to operate as a shoulder rest. A user can hold the handset with the attached device between his head and shoulder like a conventional shoulder rest. The device has a locking pin that also extends through the body of the device. When the locking pin is placed in an unlocked position, the sliding arm is free to slide to a different position. When the locking pin is placed in a locked position, ridges on the locking pin press against ridges on the sliding arm and lock the sliding arm in a substantially fixed position.