If you’re having trouble sending SMS messages, follow these steps to resolve the issue:

1. Verify 10DLC Registration (for U.S. numbers only):
   
   
   • Make sure your A2P 10DLC campaign is registered and approved in your Twilio account.
     
     
   • Learn more about 10DLC registration.(Click Here to Know more)
     
     
2. Reconfigure Your Twilio Credentials:
   
   
   • Open the Telfon app, go to Settings, and tap on Reset App.
     
     
   • After resetting, re-enter your Twilio Account SID and Auth Token in the Twilio Setup section.
     
     
   • Restart the app to apply the updated credentials.
     
     
3. Check TwiML App Configuration in Twilio:
   
   
   • Log in to your Twilio Console.
     
     
   • Ensure that your TwiML App is correctly configured and associated with MyTelfon.