This extremely easy trick discovered by Twitter user @thebaemarcus will boost up the volume of your iPhone speakers:
Step 1: Open the Settings app on your iPhone.
Step 2: Tap Music.
Step 3: Choose EQ option.
Step 4: Choose 'Late Night'.
It's done~
Step 1: Open the Settings app on your iPhone.
Step 2: Tap Music.
Step 3: Choose EQ option.
Step 4: Choose 'Late Night'.
It's done~