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# MSCriticalMessagingError.sendFailed

The message failed to send.

```
case sendFailed
```

## Discussion

The framework isn’t able to send the message for one of the following reasons:

- An unreachable or incorrectly formatted phone number
- An unavailable cellular network
- The device’s SIM is in a disabled state

> Note: The phone number needs to conform to the [ITU E.164 telephone numbering plan](https://www.itu.int/rec/T-REC-E.164-201011-I/en) standard, without any additional non-numeric characters such as dashes, periods, parentheses, or a plus character (+) that introduces a country code.

---

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