How can this challenge tell me my solution is correct while from the console i got empty list []

Challenge Task 1 of 1 Create a function named phone_numbers that takes a string and returns all of the phone numbers in the string using re.findall(). The phone numbers will all be in the format 555-555-5555.

Here is my solution for the code challenge which i got correct.

def phone_numbers(string):
    return re.findall(r'\d{3}-\d{3}-\d{4}', string)

At the below code, i was trying to test it with my local number, but after testing i got an <empty list []> instead of <0801-234-5678>

import re


def phone_numbers(string):
    return re.findall(r'\d{4}-\d{3}-\d{4}', string)

mobile_num = input("Enter your phone number eg,(08012345678): ")

if len(mobile_num) > 11:
    print("Mobile number longer than 11...")
elif len(mobile_num) < 11:
    print("Mobile number lesser than 11...")
phone_num = phone_numbers(mobile_num)
print(phone_num)

i tested my modified app to test a local number... finally this what i got. can someone please check and correct my code

-----------------------treehouse console---------------------------

treehouse:~/workspace$ python exercises.py
Enter your phone number eg,(08012345678): 08062134747
treehouse:~/workspace$ python exercises.py
Enter your phone number eg,(08012345678): 08062134747
[]