How do I make a number invisible/visible in the App?

To make your number invisible:

• Open the menu with the top left icon.
  
• Tap "Options" below the appropriate number, then "Private Mode".
• Tap the on/off button.
• You will be asked to choose a 4 digit password, then confirm it.

⚠ This password will be known only by you, so make it memorable! ⚠

It should now be displayed "Private mode active" below the number, as well as a new "Hide" button which does exactly what it says! 

To make your number visible:

• Open the menu with the top left icon.
• From there, swipe down.
• You will be prompted to enter the 4 digit password you previously chose.