My iPhone died and when it came back said my passcode is incorrect

If you forgot the passcode on your iPhone, or your iPhone is disabled or unavailable -

How to reset your passcode without a computer if you have iOS 15.2 or higher.

How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support

How to reset your passcode using a computer.

If you forgot your iPhone passcode - Apple Support

codey128 Said:

"My iphone 7 died and when it came back on its saying my passcode is incorrect"

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A Locked iPhone:

If this way laying somewhere (i.e. luggage or your pocket), then the power was likely on, and the screen was tapped far to many times. So, have Apple unlock it for you.,