Discord is a great voice/text chat tool which has IP protection.
The Android version can be found here:
But its also available on the web, Windows, OS X, Linux and iOS here:
Your IP is hidden because unlike many programs (e.g. Skype), it's not p2p (peer to peer) which just means that it doesn't go from me to you, It goes from me to the Discord servers to you.
P2P: Me → You
Non P2P: Me → Discord Server → You
The Discord server has a different IP and since they receive the packets (data) from there the IP that they see is not yours.
Though do remember not to click links from people you don't trust because they can get your IP if you open external links.