以电话来开车门？

* Subject: Have you locked your keys in the car? Does you car have remote
keys?*

This may come in handy someday. Good reason to own a cell phone:

If you lock your keys in the car and the spare keys are at home, call
someone at home on their cell phone from your cell phone.
Hold your cell phone about a foot from your car door and have the person
at your home press the unlock button, holding it near the mobile phone on
their end. Your car will unlock. Saves someone from having to drive your
keys to you. Distance is no object. You could be hundreds of miles away,
and if you can reach someone who has the other "remote" for your car, you
can unlock the doors (or the trunk).

Editor's Note: *It works fine! We tried it out and it unlocked our car
over a cell phone!"*

以上这篇是转载一位朋友寄给我的电邮。
本人非常怀疑这个做法是否可行。
因为本人尝试过了（上一会做了蠢事！），可是行不通。
找个人试一试然后告诉我好吗？