# is_group_number on GET /api/v1/phone_number/ is deprecated

Close API deprecated GET /api/v1/phone_number, query parameter is_group_number without giving a shutdown date yet.

On July 21, 2026, Close API deprecated the query parameter is_group_number on GET /api/v1/phone_number without a shutdown date. Close API also deprecated is_group_number as a field in phone number responses. Affected requests fail once the parameter is fully removed.

## What to use instead

Stop filtering on is_group_number. Filter by participant_user_id instead, which also returns the group numbers a user belongs to.

- API: Close API (api.close.com)
- Kind: Parameter removal
- Announced: July 21, 2026
- Takes effect: no date given yet
- Calls after that day: fail
- Calls it hits: `GET /api/v1/phone_number`, `query parameter is_group_number`
- Source: [Announcement](https://developer.close.com/api/overview/changelog/2026/7/21)
- Verified: November 6, 2026, against Close API's own pages
- Page: https://www.okapi.bot/providers/close-api/breaking-changes/is-group-number-on-get-api-v1-phone-number-is-deprecated/

## Close API's words

> The user_id and is_group_number fields on the Phone Number API are deprecated, both as query filters when listing phone numbers and as fields in phone number responses.

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent