A. 1. Check your internet connection: Ensure you have a stable internet connection as messages require data to send. If you are on Wi-Fi, try switching to mobile data or vice versa. 2. Restart the app: Close the app and reopen it to refresh the connection. 3. Resend the message: If a message fails to send, tap on it and select 'Resend' if the option is available.

B. 4. Clear app cache: Go to Settings > Apps > textPlus > Storage > Clear Cache. This can help resolve issues with sending messages.