How to read SMS delivery errors and what to do about each
A plain-language guide to common reasons texts fail to deliver, from invalid numbers to carrier filtering, and the first fix to try.
·2 min read
When a text does not arrive, the delivery report usually says why, but the wording can be cryptic. Most failures fall into a few categories.
Here is how to read them and what to try first.
Number problems
Invalid, disconnected and landline numbers cannot receive texts. Clean your list before importing and remove numbers that fail repeatedly. Do not keep retrying a number that is permanently unreachable.
Content and filtering
Carriers filter messages that look like spam. Triggers include unregistered traffic, suspicious links, repetitive identical content and prohibited subject matter.
- ✓Confirm your campaign registration is approved.
- ✓Avoid public link shorteners.
- ✓Vary and personalize your wording.
Account and rate issues
Insufficient balance, sending too fast for your throughput tier or a suspended number can also block delivery. Check your balance and send rate, then contact support with a few example message IDs if the problem continues.
Putting it into practice
Build a short troubleshooting routine your team can follow. First check whether the failure is limited to certain numbers, certain carriers or all messages. Then look at what changed recently, including content, links, list sources and sending speed. Review the opt-out and complaint rates for the affected campaign, because high rates predict filtering. Keep a simple log of incidents and fixes so the next occurrence is solved faster. If you manage several campaigns, compare their delivery rates side by side to spot outliers early. Catching a drop in the first day is much easier than untangling it after weeks of poor performance.
Key takeaways
- →Group failures by cause before acting.
- →Clean lists and remove dead numbers.
- →Confirm registration and avoid spammy content.
- →Check balance and sending rate.
Put this into practice with Text2Sale
Import leads, create follow-up campaigns, organize replies, and connect texting, calling, and appointments in one workspace.
Frequently asked questions
Should I retry a failed message?
Only if the cause is temporary. Permanent failures should be removed from your list.
What should I give support?
Message IDs, timestamps, the destination numbers and the error text.