Can I use the Verizon Iphone 5 in Europe?

Let me start off by saying I barely know anything about phones. I upgraded to an Iphone 5 with Verizon after years of my dinosaur phone. In a few months, I'll be going to London, Paris and Amsterdam with my grandma for about 2 weeks. Can I use the Iphone 5 there? As in, can I just call up Verizon, let them know I'm going, and be done with it? Or do I have to do something with a sim card (that I literally don't know anything about)? Do I have to go anywhere to let someone make physical changes to my phone? Sorry guys, just really confused!

How to record for a musician?

So, basically I'm a guitarist hat write my own music and wants to record it better. I have been recently torn with the issue of how to improve my recording methods. Given that I need a new phone anyway I simply fell in love with the idea of having a portable recording device with a good cam that could post right onto youtube instantly. So I was thinking of a quality phone like the iphone 5, 4s xperia z or maybe xperia s something like it.
On the other hand a phone is simply a phone and can't be my main tool for recording vids. So I feel it is necessary I buy a separate microphone and cam altogether.
my problem is now that I see a triple balance. To me the mic is the most important facet and then the quality of the vid.

my question is now, what should I do get a really good phone with an amazing cam that can record for me and maybe skip the other recording stuff or get a mic and keep using my built in webcam? If so which phone is a good cheaper alternative with still decent internet and a camera.

And finally, what are some good models of recorders, are there any good cameras of high quality recorders or should I buy them separately, some suggestion of models and recorders is much appreciated. In fact any replies are much appreciated thanks for reading!

Can I unlock my sprint iphone?

I have a sprint iphone with a sim card slot my mom got it for me for a birthday gift it says my carrier is sprint but it has a sim card slot. So was it with at&t before and then unlocked with sprint? And evn tho its with sprint can i unlock it wtih t-mobile?

My modem won't let my wireless devices connect to the internet

Ok I have an ARRIS Modem from Time Warner Cable and yesterday my iPhone turned off and I turned it back on, I tried connecting to my Wi-Fi(with the correct password) and it wouldn't let me in. Then I tried my laptop just to see if it was my iPhone or the modem, and my laptop also couldn't connect! So I guessed it was the modem's fault. So then I went onto my computer that's hooked up with the ethernet cable and went on 192.168.0.1 to check it out. I have a security mode WPA2-PSK(whatever that means.) I set the security mode to OPEN and then tried going back to connecting to the internet with my laptop and my iPhone. Then it worked! I quickly set the modem back to WPA2-PSK and set my old Wi-Fi password again so other people can't join. Then Today, I went home and my iPhone couldn't connect to the internet AGAIN! I tried my laptop and it also didn't work! So then I went back to my IP address and did the same thing AGAIN. Is there a way to fix this where I won't have to keep doing this in order to reconnect?

Best app for making collages?

What's the best app out there for making collages on an iphone 4s? My girlfriend makes them, and i wanna surprise her with one of lots of pics of me and her. Some words incorporated would be cool too.

How to add music to my iPhone with iTunes without erasing my old music?

So whenever I try syncing, I get this: "This iPhone is synced with another iTunes library. Do you want to erase this iPhone and sync with this iTunes library?"

And my only options are "Erase and Sync" and "Cancel".
I don't want to erase my old music so how can I add music without erasing my old ones that are already on my phone?