When I was young I use my horn when drivers cut me off. Now I'm more cautious & use it only to prevent accidents. I know some cities fine you for using horns for non-emergencies. I have also had a water bottle thrown at my truck when a crazy driver cut me off causing me to brake & evade...
Go check it out in person. The battery life on the S4 is bad. I had an iphone5 and the battery rocks....cause the screen is smaller I guess. and the iphone5 is so so much faster than the iphone4. check it out yourself
I'm not a mechanic but if you google "tire wear pattern" you'll see that your tire has been underinflated for a long time. And the bald area probably lead to the ripe. I have also seen this wear on front tires for those who corner aggressively.
Slow down on corners and/or check proper PSI...