Sprint iPhone 4S use in China?

I have a iPhone 4S currently under contract with Sprint. I'm moving to China and would like to use the iPhone under another carrier like China Mobile or China Unicom. My understanding is if I cancel my contract (fees may apply), jailbreak the phone, then unlock it I can use it with another carrier in China. Is this correct? Also, do I need to have the new China SIM card to perform the unlock process, or can I unlock it in the US then take it to China?

IPhone 5 16GB or iPhone 4S 32GB?

Just wondering what you guys what recommend me get.
I would love an iPhone 5 but can't really afford the 32GB, I'm worried though that I will run out of room on a 16GB, I want maybe 50 apps, 1000 songs, videos, books and I'd use the camera a good bit on it.
If so then would you recommend the iPhone 4S? I'm upgrading from a crappy android so either will be great: D Thanks

How to change apple ID for a local app store on iPhone4s?

I have iPhone 4s, recently notice an update of OS 6. After this recent update of the iOS 6.0,
I was about to update some applications such as viber and whatspp etc,. I saw a message saying that my account is not valid for use in the US store, and I must switch to the local store,
I have another apple ID, i coundnt find the way how to switch it? I used to switch several times, but after this update it looks nabt features are completely changed,

any advises will be appreciated, with thanks

Iphone 4 screen replacement? - 1

I have two iphone 4s. One will not read sim card anymore but is in great condition. The other works fine but has a shattered screen. Could i take the screen from the one that will not read sims and put it in the one that needs it? Or take the mother board from the one with the busted screen and put it in the one that will not read sims?

Where can i get free music on my iphone?

How can i get free music on my iphone? I have an iphone 4s. All my friends get their music for free and don't use itunes but i don't know how? Is there an app? I know of the websites that get it from youtube any links? I don't know:/

How to exclude attachments on email replies from my iPhone?

When I reply to an email from my iPhone, it includes the original sender's social media icons (from their signature) as attachments. The people I replied to then try to open the attachments, only to find their social media icons. How do I exclude attachments on email replies from my iPhone?