Show user phone number

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

{
  "data": {
    "id": "b7822b0a-4531-4402-a8b9-264bd756c891",
    "type": "user_phone_numbers",
    "attributes": {
      "user_id": 944,
      "phone": "+18164109865",
      "primary": true,
      "created_at": "2026-01-09T16:32:12.739-08:00",
      "updated_at": "2026-01-09T16:32:12.786-08:00"
    }
  }
}