Let’s say your using a protected wifi or unprotected wifi. Someone that wants to see your stuff on the phone goes through that wifi and goes through your phone because your using that wifi. Is it possible?
Jason Yeaman, As an RF expert, I know about the wi’s and the fi’s
Depending on the firmware you are running currently, and if the non-encrypted Wi-Fi network you are connected to has been compromised and is under control of a malicious attacker, accepting a FaceTime video call could result in the persistence of audio even after the program has been terminated by the user.
That means if you connect to an open network you don’t trust, the possibility exists that accepting a FaceTime session with a malicious hacker who owns the network can still listen to the audio around your phone even after you have terminated the program.
What can I do about it
The vulnerability was patched in iOS 9.3.3. Update your operating system through Settings.app. Don’t connect to unsecured AP’s. Don’t accept FaceTime calls from people you don’t know.
Written Wed · Answer requested by Pris Njan