Oct 9, 2013
The reason the number is out of service when you call is because its either spoofed or never existed in the first place.
Things to do:
For smart phones: Get an app called Mr. Number. You can put a number or area code on your black list, then set it to pick up and hang up on them. You can also set it so you never get a notice, so you're never bothered by it. That's the end of that and I don't think there is a limit on how many numbers you block.
For older phones: Add the phone to your list and set to silent.
Or, if you really want to get them back for the annoyance, pick up and wait for them to start talking. Blow a whistle or blast an air horn into the mouth piece for a second. Pause and listen. If they haven't hung up straight off, repeat.
You can also scream, or place the phone next to a computer speaker with the speaker phone on and play porn with the volume turned up pretty loud. Or get a fart machine.
You can also answer and say something along the lines of "This is agent [so and so] with the FBI. The number you are calling is connected to a recent triple homicide." If they don't hang up after that, demand their information - name, number, company name and address, direct supervisor, etc. Or you can tell them you're tracking their location right now and that a team will be arriving shortly to speak with them.
Or "Thank you for calling _______ County Sheriff's Department, how may I direct your call?"
Lastly, if you have the minutes available to do so, tell them you're very interested. String them along and ask them what they need from you. Soon as they ask for a credit card or something, go "oh SURE! Give me just a second!" in a really cheery voice. Put them on mute and put the phone down. Watch some TV, read a book. Come back after a few minutes, if they haven't hung up... repeat until they do.
Get family members involved. Before you mute the phone, holler to a loved one or friend "have you seen my wallet??" and have them answer loud enough to be heard by the person "No, but have you checked [wherever]?"