T-mobile unlocked Iphone 4s?

Currently I have an LG Optimus T. On my plan, I have unlimited text, 1, 000 minutes, and no data. (My parents do) If I buy an unlocked IPhone 4s from ebay, will I be able to insert my simcard? My phone right now is an Android, I just use Wi-Fi when ever I can. Will I be able to do the same on the Iphone?

I cracked my iPhone four. What's the best/cheapest way to get it fixed?

I have the worst luck with electronics. I always drop them or break them no matter how careful I'm being. Last year my ipod, I dropped it on the bathroom floor and it's actual pixels cracked on the inside of the iPod, and I had a warranty with apple for the first two years, but they sent it back. They said it had water damage, and refused to repair it. Which was complete BS but that's another story.

Now I have an iphone 4 that I just got in early June. It fell out of my coat pocket the other day on the floor. Luckily this time only the back glass shattered, but it shattered a lot, and the phone works fine but it's extremely annoying having it there. I've being using a case to hide it from my mother because she says I never take care of things and I promised her if she bought my an iphone I'd take good care of it. I'm getting a job soon, so soon I'll have money of my own, and the plan at the moment is to get it repaired without her knowing anything ever happened to it. How would I go about that? What's the cheapest way to get it repaired and where do you suggest I do so? I have a Rogers in town, and "The source" among a few other electronic device-selling places that would maybe be able to. Anybody else ever have similar experiences?

Added (1). Preferably alternatives to apple. I really don't like them.

Which iPhone should I get & which one is honestly the best?

I have used and bought a lot of apple products but this will be my first time getting an iPhone since almost EVERYONE has one now. I really want to try. So now that the iPhone 5 came out… Which iPhone is the BEST?
-iPhone 4
-iPhone 4s
Or
-iPhone 5? I've been hearing that iPhone 5 isn't as great as they make it seem, is that true? If it's not then should I get the iPhone 4 or 4s?

IPhone can't be used because it requires iTunes version 10.6.3 or later. Go to?

This keeps popping up in my itunes, what does it mean and how can I get rid of it? The iPhone can't be used because it requires iTunes version 10.6.3 or later. Go to www.itunes.com to download the latest version of iTunes.

I tried going to itunes.com on my phone to download it but there's no download button on there.

Different kinds of stage lights/lamps/systems?

Does anyone know where I can find a book or preferably an iphone app which dictates (with pictures) which are the different kinds of stage lights used on rigs/sets? (e.g: fresnels, parcans, 1k, 2k, etc… ) So i can learn which are which and when they are used?
I'm new to being a technician and would like to do as much "home-learning" as possible so as not to be in the way!
I really appreciate the help.

Should I buy from Amazon/ebay?

Well, all electronics cost about $100 more than they do in US here in Bangladesh. So I thought I would just buy it online. I'm especially worried because Bangladesh is a minor country.

My main question is there even a 1% possibility that I won't get my product or I can't contact them.

And please tell about how much will be the shipping cost of smartphones like iPhone and Samsung Galaxy SIII etc.

I can't activate my iphone 3GS?

The story began when i took my phone to a shop to unlock it.
But then they had to put it in an old version. Soon i got a bit sick of it and decided i'll go to the actual shop where i brought it (tesco) And they'll unlock it in a more proper way without having to put in an old update.

So i synced my phone and updated it to IOS 6 through my itunes but now i can't activate it or even restore it. I can't even use it as an iPod.
No sim card at all is working on my phone (when you activate your phone you're supposed to have a valid sim card) but no sim card is working at all. What am i supposed to do?

I hope my questin makes sense and if i'm supposed to get it to a shop and have it fixed then should i take it to Tesco or Apple? My phone's warranty is probebly over. It's an old 3GS.

Why does my iPhone 4S still say 3G?

I just purchased an iPhone 4S yesterday at apple. I heard people say they have 4g now, but I don't know if it is possible for it to have 4g.