Can I use a verizon iPhone 5 sim card in an unlocked at&t iPhone 4s?

My iphone 5 was stolen while abroad but i had put in a foreign SIM card so i still have the verizon iphone 5 sim card sitting at home.a friend offered me an unlocked at&t iphone 4s. Will it work if i put the sim card in?

Added (1). I understand the SIM cards are different in terms of physical size but there are adapters for that. I'm asking will it work with an adapter (so the sim card will fit the phone but will it work)? Sorry for not being clear

How to sync my iPhone/iTunes with my new laptop?

I purchased a new laptop because my old one crashed. I also have an iPhone 4.Me and my sister share the iTunes that were on my old computer, and I made the stupid mistake of trying to sync mine with the new laptop, which resulted in me losing all of my songs and apps. (my pics and contacts weren't affected). I would like to try to take the songs that my sister has on her phone and put them back into our iTunes library. How would I do this?

How to change the country on my iPhone?

So when messing around with my iPhone 4, I accidentally switched it to the UK store and now I don't know how to switch it back to the US store. I linked my phone to my computer and tried pressing the flag at the bottom of the Itunes store (like everything else says to do), but nothing changed on my phone.

How to factory unlock a sprint iphone 5?

I live in texas and yesterday i bought a sprint iphone 5 thinking that i could somehow factory unlock it to use it with ATT (go phone) straight talk or metro pcs (i already have metro and i want to get away form it). After searching the internet for hours i have not found a solution. Can someone help me? Any recommendations? Thank you so much for your help!
ps. The reason why i don't want sprint is because its expensive.

Why will my connection not work on my iPhone?

I have the iPhone 4. And my connection won't work. Like the bars are all down. It doesn't say "no service" it just shows that all bars arr down. I noticed this at school and i thought i just had no signal or whatever. Then i got home. Then my Wi-Fi started working. So i can still do everything except call and text. And my dad said he didn't change anything or turn it off or anything. And i can't ask him to call at&t because i'm grounded. So he said it shouldnt matter if its working or not.cause i'm grounded. But i still text.

so is there anything i can do or check in my setting or anything to fix this?

Why is real player converter not working?

I use it to convert video files either into audio only as an mp3 or into the video type compatible with iPods. When I do MP3 it works fine, but anytime I try to convert something to Ipod video (H.264) a pop up trying to get me to buy real player plus comes up, and the conversion doesn't start. If I close the pop up and try to start again it just comes up again. I know I don't need the upgrade for this to work, because I've done it before just fine.

What's the issue, how can I get it to work?

If for whatever reason I can't are there any free download programs to convert common video types to H.264 for Ipods/iphones?