Optional
Prepend a random country code (e.g., '+1', '+44'). Defaults to false.
Specific format string (e.g., 'XXX-XXX-XXXX', '0X XX XX XX XX'). 'X' replaced by digits. Uses locale default if omitted.
Target locale (e.g., 'en-US', 'fr-FR'). Defaults to context locale or 'en-US'.
Prepend a random country code (e.g., '+1', '+44'). Defaults to false.