What happens when i transfer my SIM card on an iPhone?

So, say I move my SIM card from my iPhone 5 into an iPhone 6.
-Will it transfer all my music, photos, etc?
-If I have a specific data plan (5gb per month, for example), will that data plan also transfer over?
-Does anything stay on the 5?

IPHONE WATER DAMAGE?

So I was outside and my stupid landlord was watering the plants with a Hose and then all of a sudden some water goes on my iPhone not a lot but now I'm scared wondering if it got water damaged. Someone can someone please tell me if it did get water damaged? And no water did not enter the phone

Car displays my IPhone and control it

I need a car that can display my iPhone and control it through the car screen and I'm not talking about the CarPlay. Because it only shows music and unnecessary stuff I need a car that just made like that not using fake system on it! Any ideas?

Headphones volume changing randomly?

When I plug in my headphones to an iPhone (iPhone 6 and 4s) my volume starts off low and if I turn the jack a little it increases in volume. When plugged into my android the volume seems to stay the same. The only real difference between the two is where to put the jack into. Android has it on the top of the phone and the iPhone on the botttom. What could it be?

How long does it take for apple to repair a phone?

I have to send my iPhone 6 in for repairs. I dropped it in water and the right side of the screen is fading and twitching black, and the power button doesn't work (although the home button does and I can turn it on). Approximately how long would it take for me to get it back?