Zebra's Hi-Mckee mini ballpoint pen has a lanyard that plugs right into your cell phone's earphone jack! You already carry your phone everywhere, and now you can easily carry a pen with stylus everywhere. The pen writes in black ink. Its cap (to which the lanyard is attached) screws on securely, preventing accidental loss of the pen while not in use. The back end of the pen is a capacitive stylus, compatible with touch screen devices.
Note: When using the stylus, hold the pen close to the stylus tip for optimal touch detection.