# 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.

- API: Close API (api.close.com)
- Kind: Endpoint 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)
- Page: https://www.okapi.bot/providers/close-api/breaking-changes/is-group-number-on-get-api-v1-phone-number-is-deprecated/

## What to use instead

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

## 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.