The exclamation mark inside a circle on the iPhone Messages app can be frustrating, as it usually indicates an issue with sending a message. If you’re encountering this and looking for solutions, here are nine ways to remove that pesky exclamation mark:

1. Check Your Network Connection: A poor or unstable network connection is often the cause of message delivery problems. Go to Settings > Wi-Fi and ensure you’re connected to a network. If you’re using cellular data, ensure you have a good signal.

2. Resend the Message: Tap the exclamation mark and choose ‘Try Again’ to resend the message. Sometimes, a simple retry can fix temporary send errors.

3. Restart the Messages App: Double-click the Home button or swipe up from the bottom of your screen (for iPhone X and later) to view your recently used apps. Swipe the Messages app up to close it, then reopen it.

4. Update Carrier Settings: Go to Settings > General > About and wait for a few seconds. If there is an update available, you’ll receive a prompt to update your carrier settings.

5. Reboot Your iPhone: Hold down the power button and either volume button (for iPhone X and later) or just the power button (for earlier models) until “slide to power off” appears. Slide to turn off your device, and then turn it back on after about 30 seconds.

6. Check for iOS Updates: Sometimes a bug in the software can cause messaging issues. Check for any available updates by going to Settings > General > Software Update.

7. Reset Network Settings: Go to Settings > General > Reset > Reset Network Settings. This action will remove all network-related settings such as Wi-Fi passwords and VPN settings, potentially resolving any connectivity issues affecting messaging.

8. Delete the Conversation: If it’s just one message within a conversation, try deleting the entire conversation and starting anew. Be warned, though; this deletes all messages in that conversation permanently.

9. Contact Your Carrier: Sometimes, issues are caused by problems on your carrier’s end that require their intervention to resolve.

If none of these steps work, there may be an underlying problem with your device that requires Apple support or a visit to your nearest Apple Store for further assistance.