Can you track a iphone without a sim card?

My sister lost her iPhone 4S. If the person who stole it can we track it if they took the sim card out? If they try to activate it with another sim card will it work?

How to connect an unlocked iphone to my carrier?

I have Boost Mobile, and currently have an Android.

If I was to buy an unlocked iphone, how would I go about connecting it to Boost Mobile?

Is Boost Mobile even compatible with an iphone?
Would I have to buy a certain type of iphone to ensure that it connects to my network?

By the way, Boost Mobile is a prepaid monthly phone service and runs off Sprint network towers. I'm not sure if this helps answers the question.

I just don't want to put down a lot of money for a phone that might not even work with my network/carrier.

How to download music from Apple Laptop to iPhone 4S?

Okay, my dad just got this Apple laptop and I know how to download music off from a Windows computer but not a Apple laptop. I got the iPhone 4S in July and I'm wondering if anybody knows how to download music off of an Apple laptop to iPhone 4S.
I have been searching for the answer but they are very confusing. I'm trying my best to get more music on my iPhone but I don't know how from an Apple laptop.

Can I get an iPhone 4s fixed at the Apple Store?

If someone trades it to me. I want to trade them my current phone for their iPhone 4s, but it's pretty badly damaged. Lock button is broken and it's cracked on sides & whole screen. Anyone know how long it'll take, how much it'll cost, or if they'll even be able to do it?

My IPhone is stuck in recovery mode - 1

So, it prompted me to update my phone with 6.1.something, and I accepted. There was a problem updating so I guess that sent it into recovery mode, the screen with the Itunes symbol and the charger. So my IPhone is NOT jailbroken and I tried holding the home and power buttons. There even was a message that said that the software that allows my device to show up in Itunes is malfunctioning and it told me to turn on something called like Bonjour. I did that and it still isn't woring. My IPhone won't show up in Itunes so I don't know how to restore it.

What can I do to get it out of this mode? Thanks!

Added (1). As I said, When I do hook it to Itunes, it is still stuck in recovery, and my IPhone does not even show up under devices.

Added (2). I tried holding down the home and power buttons, it still doesn't shows up in Itunes.

Does this mean I've been blocked?

Whenever I try to view this girl's Facebook page (on the Facebook app on my iPhone) it says, "network error". But it doesn't say that when I try to view anyone else's, so it can't be my service or anything. Does this mean she has blocked me?