How can I unlock my iPhone if I forgot my passcode?
How can I unlock my iPhone cause I forgot my screen passcode without deleting the data in it?
[Re-Titled by Moderator]
iPhone 6, iOS 12
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No backup = No recovery, sorry.
See these instructions, keeping in mind that if you don't have a backup all data will be lost on that device (except those that you eventually synced to iCloud):
If your device is running iOS 15.2/iPadOS 15.2 or later, AND if you have created a backup to iCloud, you don't need a computer:--> How to reset your iPhone, iPad, or iPod touch when you forgot your passcode - Apple Support
Shouldn't be this case (iOS/iPadOS earlier than 15.2), you need a computer. If you don't have a computer, borrow one from your friends/relatives/neighbors or ask for help at an Apple Store or Authorized Service Provider, then read these suggestions.
Given that to remove the existing passcode you must connect your device via USB to a computer (a Windows PC running the latest iTunes version, or a Mac, which can run iTunes or Finder, depending on the macOS installed on it), pay attention to the specific gestures that you need to perform while connecting your device to the computer.
These are the instructions to re-gain access to your iPhone/iPad:
If it is an iPhone:--> If you forgot your iPhone passcode - Apple Support
If it is an iPad:--> If you forgot your iPad passcode - Apple Support
Also, take a look at this support video about the same matter (for both iPhone and iPad):
https://www.youtube.com/watch?v=7s8-zLG9ySQ
Regards
Giulio