Show user phone number

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

{
  "data": {
    "id": "b3914fb5-aafb-4e73-962f-8b4257573e78",
    "type": "user_phone_numbers",
    "attributes": {
      "user_id": 965,
      "phone": "+18459808534",
      "primary": true,
      "created_at": "2026-01-21T11:23:31.519-08:00",
      "updated_at": "2026-01-21T11:23:31.566-08:00"
    }
  }
}