Has my iphone short circuited? Can i repair it from water damage?

Last night my phone fell in the toilet. I immediately got it out and put toilet paper over the ends and sucked to try and get the water out. I was then out for a while, i turned my phone off but then needed to turn it on again to find my friends to get home. The screen took a long time to load (kept switching between the apple and black) but it used to do that quite a bit anyway. It did have what looked like water in the screen. Like from the top to middle of the screen

When i got home a put it in a plastic bag with rice but did not cover much of it. I also plugged it in to charge which I now Know was a bad idea.
Today i have moved it too a box filled with rice but i can't get the sim card out (i don't have the little key thing at uni with me) and when it eventually turned on was saying no signal and it said it was charging but did not change from 4%.
1. Has it short circuited (pretty sure if so thats it)
2. Is there anything else i can do/am i doing the right thing?

If the battery is not charging then I'm pretty sure it has short circuited. There's nothing you can do about it at home so try and take to an apple store. If you are lucky then they may replace it. If that doesn't work then there are private shops where people crack open I phones and replace damged parts with new ones. Not sure if there's one around your city.

You wrapped the phone in toilet paper and sucked on it? The phone you just took out of the toilet. How did that taste?

The first thing to do when a phone gets wet is to remove the battery, but with an iPhone that is not an option. Use a hair dyer to blow heated air across and possibly into the phone. Get it too hot to hold but not so hot you can't touch it. I wish that rice urban legend had never started - it does more harm than good. The rice does not actually dry anything, it prevents drying; and it can get rice dust into wet parts inside… Bad news.