Actually, that's a good idea. Pay a robo caller to call every number in an Afghan area code 24-7. Let it ring 3 times and go to the next number, over and over. I bet half of Afghanistan would have craters in it in a week.
I don't really care if Abdul has to get up at 3am to answer a phone with no one there, I have to, why not him? Besides, he will most likely be awakened later with an explosion down the street.
Chances are the numbers are not Afghan. You can set it to any number you want.
Putting a bomb in a car is a solution for people too stupid to use a mortar or rocket.
How apropos, your response made me chuckle.