Can’t hear unless I am on speaker

Click ▶︎ Update your iPhone. 📲

If that didn’t help, then try the following:

▷ Turn iPhone on or off.

▷ Force Restart iPhone.

If that didn’t work, get expert service and support at the Genius Bar.

Click ▶︎ Start a Repair Request.

Need more help?

• Call Apple Support at 1-800-APLCARE.
• International Support.
• Contact Apple Support.
• Chat using Messages.

See if this helps: If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker - Apple Support