1

Open the People tab in Messenger. You can enter a phone number and Messenger will search for a profile that matches. This will only work if that person is using Messenger with that phone number.

The icon for the People tab looks like a list with three lines.

2

Tap the "+" button and select "Add Contact" (Android) or "Enter Phone Number" (iOS). This will open the phone number search.

3

Type the phone number of the person you want to add. Type in the phone number for the person you want to search for.

4

Tap "Add" or "Save" to search Messenger for the number. If the person can be found, you'll be able to add them to your contacts list.

5

Tap "Invite to Messenger" if the person isn't using Messenger. If the number doesn't return any results, you can send that person a Messenger invite. They'll receive the invite via SMS with a link to download the app and get started.