curl --request PUT \
  --url https://realtime-api.voiceflow.com/v1/stable/phone-number/<phoneNumberID>/unassign \
  --header 'Authorization: Bearer <token>'
  --header 'Content-Type: application/json' \
  --data '{
  "target": "sms"
}'

const response = await fetch('https://realtime-api.voiceflow.com/v1/stable/phone-number/<phoneNumberID>/unassign?workspaceID=<workspaceID>', {
  method: 'PUT',
  headers: {
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    "target": "sms"
  }),
});
const data = await response.json();

import requests

response = requests.put(
    'https://realtime-api.voiceflow.com/v1/stable/phone-number/<phoneNumberID>/unassign?workspaceID=<workspaceID>',
    headers={'Authorization': 'Bearer <token>'},
    json={
      "target": "sms"
    },
)
data = response.json()

vf phone-number unassign --phone-number-id <phoneNumberID> --workspace-id <workspaceID> \
  < body.json