The new iPad uses blazing fast LTE 4G networking to let you stream YouTube faster than you can say “Tim Cook’s your uncle,” but you still can’t use the tablet to make FaceTime calls over 4G or 3G. Calls fail to connect when the third-gen iPad isn’t connected to a WiFi network, just like they do on the iPhone.
iPhone users have been hammering for FaceTime over 3G since the video calling technology was introduced by Steve Jobs and Jony Ive back in 2010, but Apple has yet to flip the switch. Due to the data-heavy nature of video calls, the carriers are likely to blame.