How can I factory reset an iphone without having access to a computer nor being able to enter the phone to do it through the settings?

How can I factory reset an iphone without having access to a computer nor being able to enter the phone to do it through the settings?

Take it to a local apple store, they should be able to do it for you.

Take the battery out, count to 10, take out the SIM (and the SD card if you have one) then put the battery back in.
Now hold in the volume+ button at the same time as a long press on the power button.
Now wait. Eventually, you'll get the basic menu which includes Factory Reset.
Navigate the menu with the volume buttons and select with the power button.
Select Factory Reset and Yes a few times while it argues with you.
Now wait (it takes about 10 minutes).

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