What are my carrier options for an unlocked iPhone 4S or 5?

I'm looking to get an iPhone 4S, or preferably, 5 (once the unlocked ones are available in a few weeks), but since I'm not sure I'll be in America past next May, I'd like to get the unlocked version so I can have the option of using it abroad.

However, I need help figuring out which carrier I can use, contract-free, in the meantime. I barely need any minutes, but I want unlimited texts - unlimited data would be nice too.

Please advise!

Can I track iPhone gps position by IMEI?

Anyone knows if there's a way to find iPhone position just by its IMEI number without any app being installed on the phone? Also the phone isn't even turned on.

How much does an iphone 4, 4s, or 5 cost per month?

How much would one of those models ( particularly the 4s) cost per month with verizon? Would you get a discount on the monthly fee if it was on the same plan with another smartphone? How much would it cost with the 250 texts per month plan?

Unable to update apps on iPhone?

I have the iPhone 4s, just recently downloaded iOS6 but I've been having this issue since before I updated. I have updates on my apps and I want to download a couple others, but it says I have to confirm my billing information. It keeps saying my security code in invalid but it's not. I've tried re-entering all the information but it keeps saying it's invalid. I had this problem once before and it was because my card was overcharged, but I recently put money on it just to be safe and it still isn't working. What can I do?

Where can I find the iPhone 4 really cheap?

I want the Apple iPhone 4, since the 5 just came out I was wondering what store I can find it really cheap? But I don't have an upgrade until November so I want the phone now. Is there any way I can find it cheap with no upgrade? At an actual store, not ebay.

IPhone With Prepaid Plan at AT&T?

Can anyone help?

My friend gave me her brand new IPhone to use before she moved back to Europe. This IPhone has the At&T sim card in it. I currently have Tmobile "Pay as you go" plan, where I pay only $50 and get unlimited everything. I went to the local At&T store to see if I could get the same plan with them and use the new IPhone. The guy basically told me to go to hell and didn't even bother trying to explain to me why this wouldn't be possible. I heard that At&T does offer prepaid plans for IPhones… Is anyone familiar with this? I'm a student and it would be tough for me to pay $120/month for the typical IPhone plan.

My Iphone 4s plus button is broken will the apple store let me get Iphone 5?

I'm on a Verizon wireless contract and I have insurace on my iphone 4s that I have for 5 months. My plus volume button on my iphone is not working. My local verizon store told me to go to an apple store to see if they will fix it. My question is do you people know if They will let me imididly upgrade to the iphone 5 without the full 199.99 price?

IPhone 4 on iOS 6 speed problems?

Is anyone facing some performance issues after updating to new iOS. Specially slowing down of native apps like message, photos, calendar and so on

Added (1). When I updated my iPhone 3G to iOS 4.2.1 it became so slow, that it was irritating to use, that is why I'm little cautious of upgrading this time.