How to stop iMessage from syncing ios 7?

I have an ipad mini and an iphone 4. On ios 6 when I got a message on my phone it didn't pop up on my ipad, and when I got a message on my ipad I didn't get it on my phone. When i got ios 7 all of messages sync from my iphone to my ipad and vice versa. It's annoying how all of my messages pop up on both devices. I don't want my messages syncing. How do I turn it OFF?

Does apple still sell iphone 5?

I went on the apple website but I couldn't find the iphone 5! All I saw was the 5s and 5c! Are they still selling them or do I have to buy it at the store? The nearest apple store near me is in Pittsburgh! So that's a bit of a way. I want to get the iphone 5 unlocked.

Added (1). I can't get a contract. I'm wanting to get at

My iPhone 5 screen is completely black and won't stop vibrating

I went to a music festival few days ago and it started pouring rain, i was protecting my phone like it was my life.
After the festival I was really happy to find out my phone was working just fine while everyone else's iPhone lights were frozen on and other phones wouldn't even turn on, i thought i was the lucky one… After putting it to charge last night, this morning the screen was completely black! I thought maybe the charger wasn't working so I grabbed my spare and left it charging while i went to school… I came back from school and my iPhone is vibrating. It does like a double vibrate just like when you initially plug it in every 10 seconds and i won't stop! My screen by the way is still black! I tried holding the home and power button, using another charger and I just don't know what could be wrong! Like my phone is still vibrating next to me as i'm typing this and it is annoying the crap out of me. When i unplug it, it stops but my phone still doesn't work!