Formats the phonenumber as (222) 333-4444 within the input element
Binds only the number 2223334444 to the model
Can use either the directive or filter as stand alone items.
Examples of calling a cross-browser, Javascript shim - toISOString - which converts a Date object into an ISO 8601 formatted string - 'YYYY-MM-DDTHH:mm:ss.sssZ' - with a fallback for when the function doesn't exist (e.g. IE 8 or less).