# E12018 — SMSAlphaNotSupported

Alphanumeric senders are not available for the destination country.

- **HTTP status**: `422`
- **Type**: `validation_error`
- **Name**: `SMSAlphaNotSupported`

## What to do

Use a different sender type for this destination country; alphanumeric senders are not available there.

## Related

- [E12xxx — SMS sending & delivery](/docs/api/errors/E12xxx): every code in this range
- [Errors](/docs/api/errors): the full wire contract, status mapping, and error catalog
- [Error handling](/docs/guides/errors): branching on `type` and `code`, validation details, and `vendor_code`