curl --request GET \
  --url https://{subdomain}.mihu.ai/api/v1/phone-numbers/used-channels-and-accounts \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "data": [
    {
      "phone_number": "<string>",
      "phone_number_uuid": "<string>",
      "channels": [],
      "agents": [
        {
          "agent_uuid": "<string>",
          "name": "<string>",
          "channels": [
            "<string>"
          ]
        }
      ]
    }
  ]
}