number_to_phone(5551234) # => 555-1234
number_to_phone("5551234") # => 555-1234
number_to_phone(1235551234) # => 123-555-1234
number_to_phone(1235551234, area_code: true) # => (123) 555-1234
number_to_phone(1235551234, delimiter: " ") # => 123 555 1234
number_to_phone(1235551234, area_code: true, extension: 555) # => (123) 555-1234 x 555
number_to_phone(1235551234, country_code: 1) # => +1-123-555-1234
number_to_phone("123a456") # => 123a456
number_to_phone("1234a567", raise: true) # => InvalidNumberError