Can I switch to an iPhone by putting in a sim card?

So I have a samsung galaxy s2 right now and it sucks. I'm on att with a contract ending in june. I was thinking of just buying an iphone 4s and putting my sim card in it. If you buy the iphone directly from apple, its unlocked to work with all carriers. Will this work? Should i do it? By the way I really need to replace the phone. I'm also not on warranty thanks

OK this will work as long as:
1. You currently have a smartphone data plan with your GS II
2. You buy a SIM Cutter off Amazon (you will need to cut your regular SIM into a Micro SIM
3. You get a paper clip (to open sim tray for iphone 4s
4.sell your gs ii on eBay
5. Buy an iphone 4s ATT on eBay
6. If you want to unlock it you can call up ATT and it will be free if you are off contract
OR
Go on eBay and buy an iphone unlock service type in your IMEI (press *#06# on phone dial)
they will be $10+ (its permanent- regardless of software updates)

Yes, you may still use your SIM card. You will have to cut it though with a sharp knife. Look for guides on how to do it on Youtube, you'll find a lot. IPhone uses microsim which is the same SIM card only that it's smaller. Find it in youtube and you'll see what i mean.

The iPhone 4S requires a Micro-SIM card. I'm not sure what SIM card the Samsung Galaxy S2 uses but if it uses the same one, then you may be able to switch the SIM cards. If it does not, I have heard that you can just cut the SIM card to make it smaller so it will fit in the iPhone or something. Research more about that bit online.

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