HOW TO BOOST YOUR IPHONE CALL VOLUME (WITHOUT SPEAKER MODE) Calls too low even with volume maxed? Try this simple iPhone trick: STEP 1: Go to Settings > Accessibility > Touch Scroll down and tap Call Audio Routing Set it to Speaker STEP 2: Go back to Accessibility Tap Hearing Devices Turn Hearing Aid Compatibility ON Now test your call – louder, clearer, and better through the top earpiece! No extra app. Just smart settings.