He's probably referring to FaceTiming on his iPhone over a 3G connection, which is only possible with a Jailbroken device. This is one of the primary reasons (but not the only reason my iPhone is Jailbroken) because I'm constantly FaceTiming with my family back home.
This is why I Jailbroke my mom's phone, so that she could FaceTime me without needing a wifi connection, and it was easy for me to do because that was when the Jailbreakme website worked. Now, I can only update her phone when I'm home and a jailbreak is available for the current version of iOS. And that hasn't been the case for a while, but since she needed the current version of iOS to FaceTime me on my iPad, I told her just to update her iPhone since I realized that she could just use the Tango app to Video chat with me over 3G.