If the phone still rings but you can't see the UI, you've replicated a core Telecom bug.

Before Android 5.0, dialers drew their own call screens. Today, the architecture follows a strict client-server model:

// CallInfoCard.java

import androidx.constraintlayout.widget.ConstraintLayout;

CallInfoCard callInfoCard = findViewById(R.id.call_info_card); callInfoCard.setCallInfo("John Doe", "123-456-7890", "00:01");