Show user phone number

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

{
  "data": {
    "id": "3e2aec58-182d-4c27-b375-aa09fa44e915",
    "type": "user_phone_numbers",
    "attributes": {
      "user_id": 1153,
      "phone": "+16515407080",
      "primary": true,
      "created_at": "2026-02-19T12:09:19.672-08:00",
      "updated_at": "2026-02-19T12:09:19.755-08:00"
    }
  }
}