> ## Documentation Index
> Fetch the complete documentation index at: https://docs.blujay.io/llms.txt
> Use this file to discover all available pages before exploring further.

# PHONE_NUMBER_REQUIRED

> Phone number required

| HTTP status | Retryable |
| - | - |
| `400` | No |

## What happened

Blujay needs to know which of your phone numbers to use: for a group operation, one of your numbers in the group; for a capability check, the number to check from when your workspace has several.

## How to fix it

Include `from_phone_number_id`. List your numbers with `GET /v1/phone-numbers`.

## Example response

An illustrative example. The `message` wording and the contents of `details` vary; branch on `error.code`.

```json theme={null}
{
  "status": "error",
  "error": {
    "code": "PHONE_NUMBER_REQUIRED",
    "message": "Phone number required",
    "type": "validation",
    "http_status": 400,
    "retryable": false,
    "doc_url": "https://docs.blujay.io/errors/phone-number-required",
    "details": []
  },
  "trace_id": "trc_8f2a1c0e4b7d",
  "timestamp": "2026-10-14T17:30:48.000Z"
}
```

## Still stuck?

Email [support@blujay.io](mailto:support@blujay.io) with the `trace_id` from the error response. See [Errors](/errors.md) for the response format.


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