RedPhone provides end-to-end encryption for your calls, securing your conversations so that nobody can listen in.
- Use the default system dialer and contacts apps to make calls as you normally would.
- RedPhone will give you the opportunity to upgrade to encrypted calls whenever possible.
- RedPhone calls are encrypted end-to-end, but function just like you're used to.
- RedPhone uses your normal phone number to make and receive calls, so you don't need yet another identifier.
from https://whispersystems.org/
