Microsoft Teams App - Call Settings

If the Teams Mobile App is your primary usage of Teams, update Call Settings as follows
  1. Click your profile picture at the top of Teams.
  2. Then, click Settings > Calls.
  3. Make sure the setting for Always ring on this device even when active on desktop is checked.

When you're out of office and you don’t want to be interrupted by a Teams call or see the call pop-up on your phone, there is an option in the Teams mobile client to set quiet hours for yourself. Please know that using this feature is known to interfere with Microsoft Teams calls on your desktop.