# E04057 — ContactPhoneInvalid

This does not look like a phone number. Send the international form, a leading plus sign, then the country code and number, for example +31612345678.

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

## What to do

Send the number in international E.164 form. Bird checks only the E.164 shape, never whether a number is currently assigned or known to numbering-plan metadata.

## Related

- [E04xxx — Email sending & delivery](/docs/api/errors/E04xxx): 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`