The application is a one-on-one video chat—only two people can talk at once.
Unlike Mac OS X's i Chat, Face Time does not support group conferencing.
Face Time works by connecting an i Phone 4 or later, a fourth generation i Pod Touch or later, an i Pad 2 or later, or a computer with mac OS, to another supported device.
Face Time is currently incompatible with non-Apple devices or any other video calling services.
Support for the fourth generation i Pod Touch (the first model of i Pod Touch equipped with cameras) was announced in conjunction with this device's release on September 8, 2010.
Apple bought the "Face Time" name from Face Time Communications, who changed their name to Actiance, Inc.
On May 2011, it was found that Face Time would work seamlessly over 3G on all i Phone, i Pad and i Pod Touch models that supported it.