My iPhone 4's home button isn't working

Recently, my home button on my 4 isn't working. It was fine in the morning when I used it, but now for some reason it's become unresponsive. I have tried to recalibrate the home button by opening up the default calculator app, holding the power button until the "slide to power off" screen comes on and holding down the home button to force the app to close but that doesn't work. I'm suspecting this problem is from the countless drops my phone has suffered. Like just last week, I dropped my iPhone on the sidewalk and now my phone is chipped in the upper right corner (I didn't have my iPhone casing on then). But even after that it worked fine like usual until now. I'm thinking of restoring my phone and then resyncing it but I don't know if that will work. Is there any other way to fix the home button problem or should I bring it into an Apple store and have someone fix it?

Where to buy an iPhone 4S (unlocked) cheap for T-Mobile?

So my family is switching to T-mobile & we want to get an iPhone. 4S because it's cheaper.
I'm in Southern California & I've looked all over Craigslist & eBay for a cheap iPhone 4S.
I'd expect it to be around $100-200 (16GB) since 5 came out.
Where can I find a cheap one?

How do people obtain iphone 5s locked to a carrier?

I'm seeing ads on kijiji and craigslist about people selling "Brand new sealed iphone 5 64 gb locked to Rogers"

Now I'm just wondering how they are obtaining these phones, because I thought iphones could only be obtained through apple, in which you would be buying it unlocked for full price, and then through a carrier, in which you would be buying it for a cheaper price but on a 3 year contract.

Are the ads I'm seeing for phones on a contract (they don't state so, so I'm assuming they're not), or are they somehow getting iphones locked to carriers? How do they get these phones? Where do they buy them from? I just want to make sure it's legitimate.

NOTE: I know that you must be it from the carrier for it to be locked to that carrier, but I don't see an option to buy the phone full priced from the carrier! Where do you see this? I only see the option to buy from carriers with a contract.

Added (1). THE *** QUESTION IS """HOW"""

How to make Pikachu in Zed's Alchemy?

My game only goes up to 380 elements on iphone but online i found cheats to 450 elements. On this list I found Pikachu and I really want to make it. I traced Pikachu all the way back to anchovy but it says you should already have anchovy because it is a starter but I don't. Any ideas?

Should I get the Otterbox Defender case or a Lifeproof case for the iPhone 4?

I have an iPhone 4 that I've had for a few months. I've only dropped it twice but I still need a good case. I want to either get the otterbox defender case or lifeproof but I don't know which one! I know that the otterbox defender is bulky and its not waterproof and he lifeproof is slim and is waterproof but also shock proof. How is it possible that such a slim case is shock proof? It's like really thin and it looks like your phone will break if you drop it with the lifeproof case. Which one should I get? Tips?

I keep getting mailer daemon messages?

I have an iPhone 5. Ever since the iOs 6 update that linked Facebook with my contacts, everytime I text certain ppl it will send me a mailer-daemon@mx.facebook.com saying message failure. So I told my friends and when they text me it goes through and we can continue off that message. And also the texts are grouped differently. Usually, all message from the same person go into one file. Whereas now when I send one it goes into its own separate failed one and the one they send is a whole new file but same number.