Math trick!

[Capt.Propwash]

look here Chris Angel!! quit looking up US phone numbers to see if this will work! you need to quit with the math and go fly FS9/X more!  or even better go get a job where math is not required.

[Splinter562]

Spoiler Alert

Many of these tricks use variations of the same mechanic. Once you know the trick it takes all of 5 minutes to break it down... or make a new one. It's all algebra:

Take a phone number (ex. 123-4567)
Break that down into x-y (ex. x = 123, y = 4567)

Now write out the steps like you would an algebra problem:
(((x * 80) + 1) * 250 + y + y - 250) / 2

Now start simplifying:
((80x + 1) * 250 + y + y - 250) / 2
(20,000x + 250 + y + y - 250) / 2
(20,000x + 250 + 2y - 250) / 2
(20,000x + 2y) / 2
10,000x + y

That'd give you an answer in the format of XXXYYYY, same ast the phone number you started with... This one only works properly when y is 4 digits or less, which is why it only works for 7 digit phone numbers.

[Capt.Propwash]

and you have too much time on your hands to actually figure it out and break it down lol

[lunitic_8]

I'm pretty sure I left school yesterday...