To create a room from your phone, make sure you have the latest version of the Facebook and Messenger mobile apps downloaded from the App Store or the Google Play Store.
Then follow these steps:
1. Open the Messenger app.
2. Tap the People tab at the bottom right of the screen.
3. Tap Create a Room, and select the people who you want to join.
4. To share a room with people who don’t have a Facebook account, you can share the link with them. You can also share the room in your News Feed, Groups and Events.
You can join a room from your phone or computer — no need to download anything, according to Facebook.
Facebook plans to add ways to create Rooms from Instagram Direct, WhatsApp and the Portal smart display as well. Features will include 14 camera filters and changeable backgrounds.