why my code does not show the desired output when p_no > 10

p_no = input("Enter your 10 digit phone number: ")
if p_no in "1234567890":
    if len(p_no) == 10:
        print("ok")
        pass
    elif len(p_no) < 10:
        print()
        print("The number of digits in the phone number is less than 10.")
        print("Please retry")
    elif len(p_no) > 10:
        print()
        print("The number of digits in the phone number is more than 10.")
        print("Please retry")
else:
    print()
    print("Please retry using numbers (0-9)")