How to erase all data on iPhone?

So I'm planning to sell my broken iPhone 4s on eBay for "parts and repair", but I have notes on it that contain debit card info, and passwords to everything i use, so I was wondering if I could use a magnet or something to erase data just in case the buying repairs it to work. (How to erase all data on phone when it won't turn on)

Steps to take before selling your iphone: http://www.justtext.com/messageboards/20140127081812.html

You can go to an Apple customer care and ask them to dismantle to iPhone, open up the memory chip (which is the storage device of the phone) and erase the data in it. Just tell them that you want the data erased and they'll surely find out some way to do it.

I think you reset it in the settings.

Contact apple

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