How can I completely deleted, erase iPhone messages, contacts,
How can I wipe data (messages, contacts, photos) off my iPhone 4? I want to sell my iPhone 4 and need to get a iPhone, I tried to erase all contents (messages, contacts) from my iPhone 4, but it seems cannot permanently erase them at all, I need help! How can I completely deleted, erase iPhone messages, contacts, photos without restoring before selling.
iPhone 4, iOS 7