Can I put a Virgin Mobile sim card in a Sprint iPhone 4s?

Tomorrow i'm buying a Sprint iPhone 4s from my friend. I don't have the money for a plan, and I want to go pre-paid on virgin mobile. If I get an activated sim card from virgin mobile and pop it into the iPhone, will it work? Yes iPhone 4s's do have sim cards.

IPhone 4s phones, what do they do?

So I want to get a new phone but differing which one to get. I would like an iPhone but not the most recent iPhone as it's expensive and I don't need to newest version. I was going to get Pay as you go as it's easier and I don't want to spend money on getting so many texts etc when I'm not going to use it all. I want to be able to go on the interview where ever with the iPhone, will I be able to do that? And to upload to Instagram out?
What do they do, suggestions?
Thanks:-)

Added (1). Interview meaning internet.

What happens to iPhone if USB cord wasn't fully plugged into phone?

I often leave my iphone to charge overnight but recently I woke up and the phone said it was charging but it was at 10%. On further inspection, I saw that the USB cord was like half way into the power adapter.
Is this damaging to the battery? I'm worried that my new 5S is damaged because the battery seems to drain about 10% faster.

Is it safe to buy an iPhone that hasn't been fully paid yet?

So some guy I met wants to sell me an iPhone 5 for $200. The problem is that he hasn't finished paying the phone. He still has to pay $300 to T-Mobile and I was wondering, if I were to buy the phone, would T-Mobile make me finish paying it off? He said he's going to finish paying it off but if he doesn't & I end up buying the phone, will they tell me anything since he didn't finish paying it & it is now mine? Will I have to finish paying it off if he doesn't?

How to restore from backup on my iPhone 5?

I had to update to 7.04 but it restored my entire iPhone even though I did an over-the-air update. Now that it reset how can I restore from back (iCloud and/or computer)? When I right-click the iPhone label in iTunes it doesn't say "restore from back up" or anything. Please help!

Added (1). I need to do this As soon as possible:/

Added (2). It says I've never backed it up even though I have quite a few times. It evens says "Last backed up: 12:45 am"

Added (3). I'm trying to restore on my computer but it only says the current (and only) backup is the reset one.

Added (4). @Fate, on my phone it says "Last Backup: 12:45 AM" on the iCloud backup which is making me confused. It says I have never backed it up on iTunes.

Why is my iphone 5c totally blank?

I bought an iphone 5c one month ago… 2-3 days ago i was just deleting the apps which were using a lot of space in the settings and was seeing how much space does an app covers in my phone… After doing so i pressed the home button, but it wasn't working… I pressed that again and again but it was not going… Then i pressed the switch off button on the top… The phone switched off and then when i pressed that button again it was not opening back… Now it is totally blank though the sounds of the notifications and ringtone is still coming but the phone is totally blank black… Please help…

How to get my mac to acknowledge my iphone 3g?

I got an iphone 3g from a friend yesterday. Itll charge when i plug it in my mac desktop but itunes will not show up at all. I looked through system profiler and its not there either. I'm pretty sure its the iphone itself but i don't know what to do.

If I delete my iMessages, will they still be seen in iCloud?

My dad is the administrator of my family's shared iCloud account (he has the entire family using the same Apple ID and the same iCloud account on our iPhones). Because of this, I know he has access to my iMessages.

My question is: if I delete my iMessages, will they be removed from iCloud, meaning will he be able to see the iMessages after I delete them?