Possibly Skype? It does have end to end encryption but this is hard to validate independently.
Making Skype less convenient (by means of censorship) would mean that open and decentralized alternatives like XMPP get more attention, and that's a good thing IMHO.
You have to use software that people are actually comfortable with and operate within that ecosystem. At the moment Skype may well be the best bet. Try finding another piece of software that has end to end encryption and is widely adopted by non-geek's.