How to remove parental control on iphone?

Short answer: you can only remove parental controls from an iPhone you administer, and on iOS the control lives in Screen Time or in a managed-device profile — not in an app you can just delete.

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If it is Screen Time

1. Open Settings → Screen Time.
2. Tap Change Screen Time Passcode, then Turn Off Screen Time Passcode, and enter the existing four-digit code.
3. If the code is forgotten and the phone is signed in with the parent's Apple ID, iOS lets you reset it with that Apple ID and password (iOS 13.4 and later). The reset signs the device out of Screen Time limits, so you will need to set them again.
4. Turning Screen Time off entirely is Settings → Screen Time → Turn Off Screen Time. This clears limits, downtime and content restrictions on that device.

If it is a managed or supervised device

A school, employer or MDM-enrolled phone carries a Device Management profile under Settings → General → VPN & Device Management. Removing that profile requires the organisation's approval — and removing it without permission usually breaches the agreement you signed for the device. There is no legitimate unlock code for it.

If it is a third-party app

Delete the app, then check Settings → Screen Time → See All Activity for anything still reporting. On iOS a monitoring app that is not running as an MDM profile generally loses access the moment it is removed, but restrictions configured through Family Sharing (Ask to Buy, communication limits) belong to the family organiser and have to be changed from the organiser's device.

The part people skip

Removing monitoring from a phone you do not own or administer is unauthorised access in most jurisdictions, regardless of who pays the bill. If the phone belongs to your child, removing the controls is a parenting decision — worth a conversation rather than a workaround, because a child who learns to bypass Screen Time will simply do it again on the next device.