How do I erase all the data on my iPhone?

Knowing more about why you want to do this would save us a lot of time getting you the correct way you need. There are multiple ways and various levels of erasing.

Erase iPhone - Apple Support (already provided)

Use Find My to locate your lost Apple device or AirTag - Apple Support

How to factory reset your iPhone, iPad, or iPod touch - Apple Support

What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support

Sign out of iCloud on your devices - Apple Support - select not to keep data on device

Hello ~ Please don’t post your personal information here. Also we are fellow forum members and can’t erase your iPhone but click on below and review…

Erase iPhone - Apple Support

~Katana-San~