Show user phone number

curl --request GET \
  --url https://api.rootly.com/v1/phone_numbers/{id} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "91ec4aa2-d011-424f-a9ad-07372369d950",
    "type": "user_phone_numbers",
    "attributes": {
      "user_id": 513,
      "phone": "+14404649849",
      "primary": true,
      "created_at": "2025-09-26T17:30:16.177-07:00",
      "updated_at": "2025-09-26T17:30:16.177-07:00"
    }
  }
}