1. Agree on the rules first. Choose the apps, daily allowance or Downtime hours, Always Allowed essentials, and circumstances that justify a change.
2. Configure Screen Time. Set App Limits or Downtime, enable blocking at the limit, then test every essential app.
3. Lock the settings. Go to Settings > Screen Time > Lock Screen Time Settings. The partner enters a four-digit code the blocked person does not know.
4. Understand recovery. Apple recommends Screen Time Passcode Recovery through an Apple Account. If the blocked user owns that recovery account, they may be able to reset the passcode. If another person controls recovery, consider the trust, access, and account-recovery risks carefully.
5. Review after one week. The partner should not approve changes in the heat of every urge. Use a defined review time unless access is genuinely urgent.
Never give an accountability partner the iPhone unlock passcode, Apple Account password, email password, banking credentials, or two-factor authentication codes. A separate Screen Time passcode is enough for this method.