If you are one of the many Americans wanting to have more security on your cell phones, then you need a VPN. So what in the world is a VPN?
Here's a great article that can help you: https://techcrunch.com/2017/01/01/wtf-is-a-vpn/
If you are looking for a very good VPN service, I highly recommend this one, Witopia: my.personalvpn.com/ref/gOgl4opn
While we're at it, let me give you another great article explaining encryption: www.bigbrotherwatch.org.uk/wp-content/uploads/2016/08/Encryption-1.pdf