How do I troubleshoot Twilio SMS delivery issues?

Troubleshooting Twilio SMS delivery issues can be a multi-step process, but it is often quite manageable. First, it is important to verify that the phone number you are sending messages to is formatted correctly. Twilio requires phone numbers to be in E.164 format, which includes the country code, with no spaces or leading zeros. If the number is not formatted properly, messages will not be delivered. Next, check your Twilio console to examine the message status. Twilio provides a message log that includes delivery status updates for each SMS sent. If the status indicates "failed", review the error message associated with it. Common errors may include issues like an unverified sender, restrictions on the receiving carrier, or any temporary delivery barriers. Another critical aspect is to ensure that you are compliant with any regulations regarding SMS sending, such as consent requirements. Sending messages to recipients who have not opted in may lead to messages being blocked at the carrier level. Always verify that your recipients have provided consent for receiving messages, particularly in regions with strict messaging regulations. If you are using a messaging service or an API with specific parameters, double-check that all required fields are correctly set. Sometimes issues arise from incorrect configurations, such as messaging service SID or other parameters that are required for successful delivery. Additionally, network issues can affect SMS delivery. It may be useful to try sending a message to your own phone number to check if your account is functioning correctly. If you encounter intermittent issues, it could be related to carrier problems. Lastly, reviewing Twilio's documentation and support resources can provide further insights into specific issues you may face. If problems persist and you need more guidance, consider looking on Twilio's website for additional support options or contact information.