iphone is showing I have unread text messages. But there are none there.

HI. Try this Navigate to Settings / Notifications/ Messages / Toggle Bagge App Icon off and then back on. Check if it solves the issue.

If this will not help:

Try to reset your device. This won't delete your data stored on device.

• Press and hold the Sleep/Wake button
• Press and hold on the Home button
• Keep holding both buttons until the display turns off and back on with Apple logo on it.

Alternatively, you may go to Settings - General - Reset - Reset All Settings