Yes, you can chat for free with anyone. Your contacts are automatically added to Friends when you start using Jongla. After the address book sync, you can start chatting with any of your contacts.
If you have hundreds or thousands of contacts, please be patient as it might take a few minutes to sync them. Here is how Jongla Out works: your friends without Jongla will receive your first message via free SMS. From the SMS they can access a web chat without installing Jongla. It’s easy and free for both of you.
Enjoy chatting with anyone!