What's the point of gestures on the iPhone?

It's a feature in iPhone accessibility features, but I don't understand their purpose. What do they allow you to do?

If your talking about head gestures in ios 7 it's for people that may not be about to use their hands. Like someone that is in a wheelchair and can't move more then their head. It's not really meant for the iPhone but the iPad probably. It's a good idea for handicapped people but as people found out that bought a galaxys4 it's mostly something everyone will just shut off and not use.

  • What's the point of unlocking an iphone? Hi guys so i know people unlock their iphones because they want to change carrier but the locked iphones are sold for 200$ so would it be possible to buy a locked iphone in the us & unlock it in belgium? I mean wouldnt that save like 400$? That seems like an impossibly good deal but maybe i don't really get what a locked iphone is.
  • What is the point of iMessage on the iPhone? I do not get it. It's "faster"? That's all I've heard. But ever since that feature was added my texts started randomly not going thru or not sending for a few minutes. A little at first but worse and worse and now probably every day. Why not just send it as a regular text anyway? So my messages can be in a pretty blue bubble?
  • What is the point of buying an iPhone 5 if you can get iOS 6? People say when you get iOS 6, you get to get all the features an iPhone 5 has, but if thats the case then why do you need an iPhone 5? Wouldn't it just be cheaper to buy a suckish iPod and get iOS 6?
  • Is there any point of getting an iPhone 3g? Is there any point of getting an iPhone 3g now when there's and iPhone 5? I was thinking maybe older phones that have less functions work better.