Issue Description
iPhone screen becomes unresponsive while on calls.
Common Causes
Proximity sensor blockage
System UI glitch
Overheating
Step-by-Step Solution
Step 1: Clean Proximity Sensor Area
Clean area near earpiece/front camera
Step 2: Restart iPhone
Clears UI glitches
Step 3: Disable Third-Party Dialer Apps
Use default Phone app only
Step 4: Update iOS
Fixes call UI bugs
Explore Further
Hardware diagnostics if screen freezes consistently
Prevention & Best Practices
Avoid covering sensor during calls.