Django custom filter that formats phone numbers using 'phonenumbers' module.

django_filter_phonenumbers.py

@register.filter(name='format_phonenumber')
def format_phonenumber(phone, country='TR'):
    """
    Usage:
        {{ user.phone|format_phonenumber }}
        {{ user.phone|format_phonenumber: 'TR' }}
    """
    import phonenumbers
    return phonenumbers.format_number(
        phonenumbers.parse(phone, country),
        phonenumbers.PhoneNumberFormat.NATIONAL,
    )