human
How to use my phone as a mic on PS4?
assistant
Use Your Phone As a Mic on PS4
1. Navigate to Settings and press X.
2. Navigate to Remote Play Connection Settings and press X.
3. Press X to check the box next to "Enable Remote Play."  
4. Activate this PS4 as your primary console.
5. Open PS Remote Play on your phone.
6. Sign in.
7. Tap PS4.
8. Tap the microphone icon.