Sometimes the iPhone gets stuck and thinks it has regular earphones or ear buds attached even though you don’t. Here are a few things to try.

• If you have a regular iPod headset, try attaching those to your iPhone and unplugging them several times.
• Plug and unplug your iPhone headset several times.
• Lint may be trapped in the connection. Try blowing into it or try canned air.

Ensure the unit is unlocked while performing these steps.