There are a couple of different modes in the app that you can use: 1.1.1.1, WARP, WARP+, and WARP+ Unlimited. 

Free services:

• 1.1.1.1 lets you protect your DNS queries by encrypting them with HTTPS and TLS. We use our 1.1.1.1 public DNS resolver to resolve your queries and prevent ISPs from spying and selling your data. This was our original product offering, and it will always be free.
• WARP is 1.1.1.1, but better. We still encrypt your DNS requests, but we leverage our global network of data centers and a more modern protocol to make your internet even faster. WARP will always be free for our users.
• With WARP+, we route your internet requests to avoid Internet traffic jams, making it even better. WARP+ runs on a limited data plan — the more people you refer, the more MBs of data  you can use with WARP+.

Paid service:

• If you would like to secure all your mobile traffic without any data limits, you can get WARP+ Unlimited by buying our monthly subscription.