How to tell if iPhone has been hacked?
Last week I kept getting a pop-up asking me to enter in my Yahoo e-mail account password, even though I was already logged in. I didn't enter a password. Just kept hitting cancel... Today I realized that my e-mail has been sending out spam, so I changed my password. However, it's sending out spam to contacts that are in my iphone only. My address book for my Yahoo account is completely empty. There are no contacts listed. I deleted the account from my phone and plan to reinstall. Will that help? Is there something else I can do? I do not have a jailbroken phone and it's been in my posession at all times.
iPhone 4S, iOS 7.1