AT&T has been slowly reducing restrictions on Apple's FaceTime. The latest reduction in regulation comes in the form of AT&T allowing iPhone 4S users on a tiered data to use FaceTime over their cellular data. Previously, AT&T would not let non-LTE devices use FaceTime over the network. This change also means that other smartphone devices that don't feature LTE will be able to video chat over cellular data, again, provided that they are on a tiered data plan.
AT&T Mobility VP Mark Collins:
When FaceTime over Cellular launched in September 2012, we explained that we wanted to roll it out gradually to ensure the service had minimal impact on the mobile experience for all of our customers.
As a result of ongoing testing, we're announcing AT&T will enable FaceTime over Cellular at no extra charge for customers with any tiered data plan using a compatible iOS device.
This means iPhone 4S customers with tiered plans will be able to make FaceTime calls over the AT&T cellular network. AT&T previously made FaceTime over Cellular available to customers with a Mobile Share plan and those with an LTE device on tiered plans.
Of course, FaceTime over Wi-Fi remains available for all customers who have a compatible iPhone or iPad.
The new update to video chat regulations will roll out automatically over the next few weeks. AT&T says everything is automated, so all you need to do is be patient.