Show user phone number

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

{
  "data": {
    "id": "f6f6d0e1-acfb-40a5-96cf-f4103751cf28",
    "type": "user_phone_numbers",
    "attributes": {
      "user_id": 1055,
      "phone": "+14197744272 x1156",
      "primary": true,
      "created_at": "2026-01-30T06:43:11.267-08:00",
      "updated_at": "2026-01-30T06:43:11.331-08:00"
    }
  }
}