Why Your Text Message Might Not Get Delivered (And What You Can Do About It)

Sending a text message should be simple: type it, send it, and expect it to arrive. But sometimes, messages don’t get delivered, leaving you wondering what went wrong. There are several reasons a message might not reach its recipient, ranging from carrier filtering to user settings on their device. Understanding these potential roadblocks can help you improve your sms delivery and ensure your communications reach their intended audience.

1. Carrier Filtering

Mobile carriers actively monitor and filter messages to protect users from spam, fraud, and policy violations. If a message is flagged for any of these reasons, it may be blocked before reaching the recipient.

Common triggers for filtering include:

• Content violations, such as SHAFT-related topics (sex, hate, alcohol, firearms, tobacco)
• Sending unwanted traffic, including CBD, gambling, or other restricted content
• Excessive use of opt-out keywords like “STOP,” which can signal spam-like behavior
• Missing proper opt-out instructions, making it difficult for users to unsubscribe

For a deeper dive into how carrier filtering works and how to avoid it, check out our detailed carrier filtering blog post.

2. Invalid or Deactivated Numbers

One of the most straightforward reasons for a text message delivery failure is that the recipient’s phone number is no longer valid. This can happen if:

• The number was mistyped or outdated
• The recipient has switched carriers and changed their number
• The phone line has been disconnected or reassigned

Regularly updating and verifying your contact lists can help minimize messages sent to invalid numbers.

3. User Opt-Outs

If a recipient has previously opted out of receiving messages from your number, any future attempts to message them will fail. This is a critical compliance requirement enforced by carriers and industry regulations.

To maintain a positive sender reputation:

• Provide clear opt-out instructions in your messages
• Respect recipient choices and avoid re-sending to opted-out numbers
• Offer an easy way for users to re-opt-in if they change their mind

4. Carrier or Network Outages

Sometimes, the issue isn’t with your message—it’s with the carrier. Carriers occasionally experience network outages or temporary service disruptions that can delay or block SMS delivery. These issues can be regional or widespread and usually resolve on their own.

5. Sending Limits & The Campaign Registry (TCR)

SMS sending limits vary based on how your business is registered with The Campaign Registry (TCR):

• Sole Proprietor Registration: Limited to 3,000 messages per day.
• Private Company Registration: Allowed up to 6,000 messages per day.
• Higher Volume Needs: Businesses requiring more than 6,000 messages per day must undergo additional vetting through TCR to increase their limits.

Ensuring proper registration and vetting can help prevent message throttling and improve deliverability.

6. Device-Level Blocking

Even if your message makes it past carrier filtering, reaches a valid number, and isn’t affected by network issues, the recipient’s device settings can still prevent it from being seen. Many modern smartphones allow users to:

• Filter messages from unknown senders into a separate inbox
• Enable AI-driven spam detection that blocks suspected spam messages
• Set custom message blocking rules

The best way to avoid this issue is to have recipients save your phone number as a contact on their device. Messages from saved contacts are far less likely to be filtered or blocked.

If you suspect device-level blocking, encourage recipients to check their spam or unknown senders inbox.

Improving Your Text Deliverability

Understanding why messages fail to deliver is the first step toward improving your overall message success rate. By keeping your contact lists updated, following carrier guidelines, and monitoring message performance, you can significantly reduce delivery failures.

However, text message delivery is highly nuanced and can vary based on carrier rules, message content, and recipient settings. If you suspect a delivery issue, please reach out to our support team at support@projectbroadcast.com. Our team will work to open tickets with the carriers on your behalf.

To get traction with the carriers, we must provide recent message failures and contact details from the last 24-48 hours—older data will not be investigated. Having this information ready will help us expedite the resolution process.

If carrier filtering is a concern, don’t forget to check out our carrier filtering guide for more insights. And as always, if you need help optimizing your messaging strategy, we’re here to assist!