"Learn and teach others about using *677 on your cell phone while driving. With all kinds of nuts out there, if you are signaled by what looks like an unmarked police car or any car with a flashing light on top to pull over DO NOT PULL OVER. Use your cell phone and call *677 which will get you to a police dispatcher who can tell what is or is not going on and advise you accordingly.
Do not stop for anyone until you know you will be safe. The dispatcher will check to find out if it is indeed an unmarked police car. If it is, it will be radioed to tell them you will not stop until it is a safe area. If it is not an unmarked police car, and a serial killer or rapist or whatever evil-minded person is trying to get a hold of you, your actions will keep you safer.
Drive to the closest and safest area preferable a police station. This actually happened to a young woman named Laura who heeded her parents advise to never stop for an unmarked car. It was only 1:30 in the afternoon. When the unmarked police car pulled alongside her car with their flashing light on their rooftop, and signaled for her to pull over, she kept going and immediately punched in *677, gave the info to the dispatcher who checked it out and called her back to tell her there were no unmarked police cars in that area.
She was told to keep driving, and backup was already on the way. In a short time 4 police cars surrounded Laura and the suspect car. One officer went to Laura's car to protect her. Every other police officer went to the unmarked police car and apprehended a convicted rapist wanted by the police for other crimes. Cell phone companies do not advertise this *677.
I want everyone to know about it, and I want everyone to email, call or tell everyone they know about it. If someone doesn't have a cell phone, just keep driving and go straight to an area with other people around. I'd drive to a police station if one were close enough. We all have to help one another."
Snopes has a great write up on this. You can read it here:
The #677 probably will not work. #77 will work in some states. The safest bet is to just call 911 if you think the person pulling you over is not a cop. You can dial 911 on any functioning cell phone (even a phone without a service plan should work).