Sprint Family/Data Plan

Okay, so right now I have a family "simply everything messaging" plan that doesn't include data. I'm wanting to upgrade my basic phone to an iphone without changing my whole plan to a family data plan. I saw online the option for adding a data service onto one phone for $15. Does that mean that i can keep my old plan and pay $15 for data a month extra just for the iphone? Or what exactly is the added "data service?" Thanks so Much!

I lost the fb app on my iPhone

I can't find it on my iPhone it's literally gone and when I go to the app store i can't downloaded it because it says it's installed what do I do? I hate having to go on google because it's much slower than the mobile app version!

Downloading music on iPhone?

Ok so before anyone says it I 100% buy all of my music of iTunes! However I want a ding that hasn't been released on itunes yet so I need to download it, is there any way I can download it and for it to go on my actual iPod/music part of my phone. I know there's an app but the music stays on the app and I want to add the song to a playlist:-)?

Use IMEI blocked iPhone on another carrier? (Read description first)?

The phone was legitimately purchased by me at GameStop. The phone worked for a few seconds and quit on me. By calling 611(the AT&T wireless customer portal), it indicated to me that it's IMEI blocked. I'm using a GoPhone SIM card and was wondering if I could just use T-Mobile instead to use the phone.

Added (1). Edit: I was using an iphone 3G for about a year and then moved my card over to the 4s.

If Someone Knows Your Apple Account Password What Can They See And Do?

My brother says he'll give me his old iphone if i give him my apple account password and if i get a tracking app on it too. What could he see on my apple account? Would you take the iphone for all that?

Added (1). Would he be able to see my messages and photos and facebook and twitter?

My iPhone 4 keeps freezing up and isn't working, what do I do?

Ok yes I jailbroke it. And it worked fine for a while, then when it started freezing up i obviously suspected it because of the jailbreak, so I plugged it up and restore it to the original settings as a new iPhone. So it isn't jailbroken anymore. But every time i slide to unlock it, it freezes up for quite a while before opening, I can't type anything because every time i get on anything using the keyboard it freezes, I can't make calls, I can't really do anything on it. I understand that jailbreaking it wasn't smart, I'm only asking for someone to tell me if they know how I could possibly fix this. Please serious answers only, thanks