If you have bought a Dropbox from your iPhone, iPad, or other OS devices, you can cancel your Dropbox subscription or free trial by following these steps:
- On your iPhone or iPad, tap Settings.
- Tap your name.
- Tap iTunes & App Store.
- Tap your Apple ID at the top of the screen, then tap View Apple ID.
- Tap Subscriptions (about midway through the screen).
- Tap Dropbox.
- Tap Cancel Subscription or Cancel Trial.
- Tap Confirm.
Your account will downgrade to Dropbox Basic (free) at the end of your billing cycle.