I sold my iPhone and the person I sold it to must be using my FaceTime, because a pop up on my iPad says that FaceTime for iPhone is being used with my email address? How do I stop this? Should I be concerned about it?
Did you wipe your phone before you sold it? Or did you leave all of your account info set up on it?
Did you not factory reset the phone prior to giving it to someone else? They are probably signed in with your iTunes or iCloud account which would not be a good thing.
Unregister the phone here: https://daw.apple.com/cgi-bin/WebObjects/DSAuthWeb.woa/wa/classicLogin?appIdKey= 58ef9db8ff4d201409e7270a68e4408ae1678e1618204c476572a1b5e5fb3518&path&language=U S-EN
It would be wise to immediately change the password on your AppleID and every other account you used on the iPhone.
Retrieving data ...