Troubleshooting

• Why can't I send or receive messages from an iPhone?
• How do I use Message Logs?
• MM4 error codes
• Requesting MMS Delivery Receipts for MM4 users
• How do I enable MMS Delivery Receipts when sending messages?
• Are delivery receipts available for international destinations?
• Is delivery 100% guaranteed?
• Can I get Delivery Receipts for MMS messages?
• Does Bandwidth retry HTTP messaging callbacks if my callback URL isn't reachable?
• What do I need to do to ensure my messages don’t get blocked?
• How can I tell if my messages are being blocked?
• What should I do if my messages are being blocked?
• Message Detail Record field descriptions
• SMPP SMS Delivery Receipts and Error Codes
• Delivery Receipt (DLR) FAQs