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)

I accidentally deleted all my music on my iphone 4s?

Ok so i was going to update my phone and it said i needed more storage so i was looking at the apps and i accidentally swiped over music and clicked delete. My ipad still has all my music though. And i purchased it under the same account. Shouldnt itunes just let me re download it if i purchased it on my ipad? I really don't wanna buy all my music again. Is there anyway to get it back? Plus my computer won't let me update itunes either. So i can't sink it back. Dang apple products:/

Can a Verizon Apple Iphone 5 be used in India?

My brother will be coming to India from USA. He is planning to gift me an iphone on my bithday. He is deciding to buy a Verizon Apple Iphone. Will it be compatible with Indian carriers like Airtel, Vodafone? I have also read on the internet that these iphones are in contract with the USA carriers which require an unlock code. Will it be compatible with Indian carriers? I contacted Airtel that there sim cards will be compatible with the iphones from the USA too

Can't send/receive pictures between iPhones?

I have an iPhone 5 and the phone I'm trying to et pictures to and from is an iPhone 4, and I've received pictures before, but now I don't. I turned my cellular data on and nothing. Turned my iMessage on, nothing. I sent a picture to the other phone, and nothing. It's getting frustrating. I've turned my phone on and off. And it resets by itself randomly, and I'll get old photos from other people. But not from the person I'm texting. Any help?

Links To Cute iPhone 5 Cases?

Hi! I have an iPhone 5, and I was wanting a cute, relatively cheap, and somewhat protective phone case. I want it to be bright and more for the summer. I also like the pattern chevron. Thanks if anyone could give me links to websites.

IPhone 5c fell in water

Ok I was recording under water with the life-proof case and I guess I didn't make sure it closed good. And I took it out as fast as I could dried it up. I've heard you could put it in rice to absorb the water. Would my phone work if I put in rice for a few hours and use the blow dryer to dry it. After that would my phone work?
And if it doesn't tell me the steps to save my phone it's new and I don't want my mom to get mad so I need ways to fix it before she gets home.

How to crack the back of my iPhone but not the front? - 1

I want to crack the back of my phone. I tried just cracking the back of my phone once but ended up cracking the front. I want an effective way to crack just the back. I tried hitting the back lower left corner with a screwdriver handle but it didn't work.