Does the dead really communicate with the living?

Read the brief story first. There were these 2 teens who recently died in a car crash recently near where I live. One of them had just graduated a week before the accident happened. The other one had a year left of school. The driver was a teen who was going way to fast for the road conditions, but when he crashed the car, it spun and rolled into a tree or something, and the driver actually lived. I know people in this town, and it is sad news throughout the small town, and was a big topic for the big city nearby on the news station at the time. A buddy of mine who is friends with someone that was a good friend of the teen that had just graduated a week ago, received a missed call on his cell phone after the kid died. My buddy replied to the kid who received the call's facebook wall post. The dude who posted this up on face book, said he swears on his life that he received a missed call, and he and one of his other good friends called the number back and said it was disconnected. This kid has the missed call saved in his phone, and it was from the phone number of the dead kid who just graduated. Do ghosts really try and communicate? Now, I don't personally know the kid who got the phone call, and it could be BS, but this guy was a good friend of the kids who died, and wouldn't joke about it through others that know him. How do ghosts communicate with the living?