Unlocking Iphone 4S - consequences?

I want to by the 4S or the 5 (if I see a good deal) but I'll order it from abroad because its cheaper. The thing is some are locked to foreign companies such as O2, Vodaphone, etc. If I take my Iphone to someone to make this limitation disappear how will it affect the devise? Will I be able to access Itunes, download new apps, updates, etc?

I ordered a brand new iPhone 5 from Amazon?

So I had ordered a brand new iPhone 5 from Amazon and i have the iphone 4 but will there be any fees since I don't have an upgrade in the near future to get a new phone? Will I have to pay a lot to switch the phones?

Iphone 4camera scratched any way to fix this?

I have recently noticed while taking a picture that my back camera is scratched. This is causing my photos to come out very blurry. Is there any way possible that this can e fixed? My parents unfortunately are not willing to replace it. Any helpful answers are appreciated thank you.

Added (1). Thanks. Do you know where a good place to take it?

Jammed iphone 4s sleep button?

Well recently today, my iphone sleep button all of a sudden got hard to press down on. It hasn't been water damaged or cracked or dropped in that area. Does anyone know why this happens and how much a repair would cost?

I Dropped My iPhone 4 on the Ground and Now the Speakers Won't Work?

I swear it was by accident! I had finished up Christmas and I was trying to all of my bags out of my car. I didn't that my iPhone 4 was sitting in my lap, and slipped and fell on the ground, cracking the back of it. And now the speakers don't work. I mean the rest works fine like music, but my ringer and any sounds for any upcoming text messages and voicemails just stopped working.

This is the first time I dropped and I want to fix it, but I don't know how! Someone please help me quickly because I'm seriously about to cry right now!

Does The Iphone 5 Factory Sealed Come With A Free Sim Card?

Today I Brought An Apple Iphone 5 Factory Sealed And Unlocked So I Opened the phone and it did not looked new it came like used also it came with a sim card from at&t and i was wondering if the phone was used? And also it had like scuffs

New iOS 6.0.2 update on iPhone 5?

So I downloaded the new iOS update and my camera doesn't work anymore and my messages won't open. Is this from the update? How could I fix this problem? Should I restore my iPhone?