"Validate a phone number."
The code is entirely wrong. That validates something that's close to a NAPN number but isn't actually a NAPN number. In particular the area code cannot start with 0 nor can the central office code. There are several numbers, like 911, which have special meaning, and cannot appear in either position.
You'd get better results if you went to Stack Overflow and stole the correct answer yourself. Would probably be faster too.
This is why "non technical code writing" is a terrible idea. The underlying concept is explicitly technical. What are we even doing?