Show user phone number

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

{
  "data": {
    "id": "d28c401b-a494-4c21-8c01-2c3b1218c323",
    "type": "user_phone_numbers",
    "attributes": {
      "user_id": 617,
      "phone": "+16125731652",
      "primary": true,
      "created_at": "2025-12-19T18:18:58.774-08:00",
      "updated_at": "2025-12-19T18:18:58.844-08:00"
    }
  }
}