A few things you should know
-The iPhone is AT&T
-I have Sprint personally
-It is an iPhone 4s with iOS 7 installed.
Here is a problem I have came across
-The email for the original Apple account was not verified, therefore I can't disable "find my iPhone" under iCloud settings.
My question(s)
-What should I do to unlock this iPhone for my own use on my Sprint network?
-Do I need to get an iPhone Sprint SIM card to proceed?
-What is the easiest method for what I'm trying to accomplish?
Please remember that I don't even know where to start, so it is okay to talk to me as if I don't know anything (In fact, I prefer it, I want to be taught)