Here is a way to open your car door, when you have left your keys in the
ignition.  This only works on automatic door openers.  If your spare is
at home, or with another party, call them on a cell phone and have them
beep you with the spare.  Hold your cell phone about a foot or two away
from the auto.  The lock will release and the door will open.  It does
work.  Many of you may be already aware of this neat trick.  But I
thought I would pass it on for those of you not in the know………