Disable restriction
I cant use any apps show apps is restricted.
iPhone 6s Plus, iOS 13
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Use parental controls on your child's iPhone, iPad, and iPod touch - Apple Support
If you forgot the passcode [including a restrictions passcode] for your iPhone, iPad, or iPod touch, or your device is disabled - http://support.apple.com/HT204306 - You can restore from a backup but that backup has to date from before you set the restrictions password.