Show user phone number

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

{
  "data": {
    "id": "b38b9c1d-78e2-4d86-bbc1-3ff6be82eee9",
    "type": "user_phone_numbers",
    "attributes": {
      "user_id": 563,
      "phone": "+12168647003 x9196",
      "primary": true,
      "created_at": "2025-11-28T18:14:15.858-08:00",
      "updated_at": "2025-11-28T18:14:15.949-08:00"
    }
  }
}