You can cancel any time from Settings → Account. You keep full access until the end of your current billing period.
Steps
Go to Settings → Account.
In the Subscription Plan section, find Cancel Subscription.
Click Cancel Subscription and confirm.
What happens after you cancel
Your subscription stays active until the end of your current billing period — you don't lose anything immediately.
Settings → Account will show a "Subscription Cancelled" notice with the exact date your access ends.
After that date, your account loses access to Doorkeep features and your number stops being answered.
What to expect
Only the account owner can cancel.
Changed your mind before the period ends? You can re-subscribe from the same page.
Want to keep your call history and contacts before you go? Request a data export from Settings → Account first.