What do I need to do to use my iphone overseas?

I want to take my iphone overseas to take photos, update my status/pic on facebook and to be able to sms home to Australia. I have unlocked it and Vodafone has told me to get a sim over in the US, is that all I need to do?

Why does my iPhone battery go down so fast?

I have the 4S. I know the 5 is bigger and has 4G of course, but there are speculations the battery life is worse. My iphone has all of a sudden been going down fast just by being on standby. I use my phone regularly, everyday. I've had it since last march. Lately it goes down a lot on standby rather than when I'm actually using it… Why is that? Is there a way to save battery a little more without
1.turning it off instead of putting on standby
2. Buying a mobile charger ( already have that)
3. Shutting down apps (not really effective)
4.getting new phone
Anyone have this issue with the iPhone? Other than that in my opinion the 4s is still amazing to me to this day aside from battery life.

Where to find nice unique iPhone cases?

I recently got the iPhone 5 and want a unique case. Please don't give me like the apple site or something. If you know of a nice case or website please comment!
I'm looking for something different like I've been looking at bamboo cases, cases that make the phone look that a tape recorder or etc, cases completely made out of bottom of shoe rubber pattern, cases made of cork.
That's an idea of things I've been looking at but wasn't sure about.
Not too expensive cases please.

Iphone won't sync with Itunes?

I got a new laptop and set it all up with itunes and all that jazz but everytime I try to sync my iphone with the new itunes library it says not enough space the option for replacing new library with old doesn't even pop up. What should I do?

Added (1). And the new library doesn't even have as much music as the old one and it all fit still.

My iPhone loses battery too fast?

My iPhone loses it's battery way too fast. First it was 100 and after a little while I Checked it was 50% left o. O it's back also heats which I guess makes the battery lose fast… Please answer this question do I have to change the battery or what?

Why isn't iCloud backup returning my camera roll?

I have an iPhone 4s with version 6.1.2. Before I recently restored my iPhone I backed up my camera roll to iCloud. It said there was 3.2GB worth of photos backed up. After I restored my phone and tried to get my camera roll back via iCloud backup they did not show up. The backup still says there's 3.2GB of photos backed up but they're not in my phone so I can see them. I also tried to back it up on my pc but it says the backup is "corrupt or not compatible with the device". Someone please help there were over 1, 000 photos in my camera roll and I'm afraid I'll never get them back.