9to5Mac relays a screenshot from one of its readers which seems to suggest that iOS 5 supports FaceTime functionality both over 3G and Wi-Fi. In its current form, FaceTime only works over Wi-Fi and it’ll be interesting to see how carriers react towards the data heavy FaceTime feature being used across its 3G networks. Of course, if we assume that 3G speeds can’t keep up with the bandwidth required by FaceTime, perhaps users will avoid the option, if indeed available, altogether.
Below, the error message reads: “Turn on cellular data or use Wi-Fi to use FaceTime.”
More likely than not, FaceTime via 3G, if in the cards, will be subject to approval on a carrier by carrier basis, much like how MMS and tethering currently operate as well.