Unlocking iPhone 5 with AT&T?

I have an iPhone 5 with AT&T right now which is about a year and a half into its 2-year contract. I'm currently living in Spain, however, and am looking to get a SIM card that will work here in Valencia. I found a fairly cheap SIM card that I can order which will fit in my phone and work in Spain. I understand that I need to unlock my phone, though, for that to work. Is there a way to find out if my phone can work internationally? And if it can, is it bad to unlock a phone for use with other carriers?

Is it hard to do and how can I?

Should I fix my phone screen or just get a new iPhone altogether?

My iPhone 4 is really cracked to the point that I can barely see the screen anymore and I'm trying to decide whether I should fix the screen or just buy a new phone altogether. I was thinking of getting the 4s. What do you think I should do? And how much would it cost roughly to either fix the screen or buy an iPhone 4S?

Can't get my Iphone 5S out of recovery mode?

So two days ago I tried to download the newest Apple software update (7.0.5 I think!) onto my new IPhone 5S, my phone proceeded to switch itself off (which is usually the norm when downloading an update) but when it turned back on it just had a black screen with prompts for me to plug it into itunes - this is all my phone has done for two days and I can't use it for anything even after trying a hard reset etc it still won't turn on properly.

When I did plug it in, itunes told me that the phone was in 'recovery mode' and that I'd need to restore it from backup in order to get it to work. When I tried to do this it wouldn't allow me and instead prompted me to download the new software through itunes onto my phone which would get the phone out of recovery mode.

I've tried to do this twice now and after waiting for two hours (each time) for the updates to download, it finishes and then itunes says that it's 'processing the update' but both times I've been greeted with 'error 9066' telling me it's unable to complete the process as I'm not connected to the internet - which I clearly am as I have full Wi-Fi signal and everything is operating as normal on my laptop.

Can anyone help me save my phone without me having to send it away and lose all my photos and messages etc?!

How to get new iphone when it comes out?

I got a iPhone 5s. But when the iPhone 6 comes out i probably want that one. So my question is, how can i get the new one? I'm stupid and evil to break it and get my money back, but how? Or can i trade it in for a new with a little bit of money?

ITunes is not recognizing my iPhone?

It's an iPhone 4s if that matters. It's plugged in, *and* my computer even recognizes it. When I start up iTunes though, it doesn't notice that there's an iPhone 4s plugged in.
What's wrong, and what do I do to fix it?

Smashed Iphone repair cost?

I smashed my boyfriends iphone 4 and the back is completely shattered and the front isn't that bad but the top and the bottom of the front screen has come off and the button is hanging off! The phone still vibrates when getting a text and beig called and he can answer the phone when someone rings him but the screen is black and you can't see anything! How much roughly will it cost to repair it and where do I go?!

Internet gets disconnected when I plug in my iPhone to PC?

My PC used to connect directly to my Internet ADSL router. One day I changed the PC's power supply and ever since then every time I connect my iPhone (I have 2 of them) to my PC using USB cable, the router would disconnect and then reconnect. After several disconnects, my ISP would gradually lower the speed. When it gets too slow I would call up the ISP and ask them to reset the connection so that I get my usual speed again.

I then thought it was probably to do with a bad power supply, so I installed a Wi-Fi adapter on my PC, and connected through a Wi-Fi router (which connects to my ADSL router). This way there's no cable connecting my PC to any of the routers. It worked for some time, but then the same problem happened again when I connected my iPhone to my PC after a few weeks.

Has anyone experienced this before and know of a solution?