Forgot my passcode
How do I reset my passcode for my iphone6 without a computer???
iPhone 6
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If you had Find iPhone enabled on the phone and if the phone is online, you can try sending a remote wipe message to it from the Find iPhone app on another iOS device or http://www.icloud.com
If you didn't you will have to connect it to a computer's iTunes : If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support