Thank you!

You should use the argument of your function n, not create random numbers.

I imported random.
I set up area_code and prefix to randomly take 3 string digits and line_number to take 4 string digits. I set up return to generate the numbers where they belong.
I'm getting these errors:
'(381) 127-4848' should equal '(123) 456-7890'
'(822) 869-8435' should equal '(111) 111-1111'
'(769) 704-8103' should equal '(123) 456-7890'
'(702) 922-2003' should equal '(023) 056-0890'
'(201) 455-5480' should equal '(000) 000-0000'
How do I force my random numbers to generate their random numbers?
I must be missing something.