I can't open my iphone
I am trying to help my auntie she lost her password
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Are you referring to her Apple ID password, or the passcode used to open the iPhone? It mades a difference in what to do. If your device meets the qualifications here, you can do it without a computer. How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support
If the device does not meet these qualifications, then you will need to use the instructions here, If you forgot your iPhone passcode - Apple Support