Q: I like to use my speaker instead of always putting to my ear .How do you turn up volume on the speaker on the iPhone SE?

You would turn the volume up for the speaker while in a speaker call. The volume buttons control different aspects of volume, such as the ringer, music, speaker volume while in a call. You change certain volumes based on what you happen to be doing at the time. When you first unlock the phone and are just looking at the home screen, if you tap the volume buttons then, you are adjusting the ringer volume. Changing the speaker volume when in a speaker call, is done while in the call itself, just like changing the earpiece volume, only while in the call.

Use the volume buttons on the left side of the iPhone.

You're welcome.