Is my iPhone basically indestructible?

I have a white iPhone 4 and I got it like 2 weeks ago and I wanted to be an idiot and crack the back of it so I could color it with sharpies and whatnot, I've dropped it hard on tiled floor, concrete and a brick wall pretty high up and nothing happen even though it sounds like it did some damage, I probably sound stupid, I've even slammed it on the floor and on a wooden dresser and still hasn't cracked and the phone is still flawless

Can the Ringo Pro app be used with iphone?

I was using an app (Ringo Pro: Text & Call Alerts) on my Samsung (Android phone) before switching to an iPhone 6 and would like to know if I can use Ringo Pro on the iPhone to set individual ringtones and text notifications.

My iPhone crashed and it won't turn back on?

So I have an iPhone 4s and it just blacked out or crashed earlier today. I have no clue why it crashed but I can't charge it or hook it up to iTunes. I don't know what to do so any help is better than none.

HOW LONG DOES IT TAKE TO RESTORE A IPHONE USING ITUNES?

I JUST BOUGHT A USED IPHONE 3GS FOR MY TEN YEAR OLD DAUGHTER FOR HER BIRTHDAY! THE PHONE HAD A FOUR DIGIT PASS CODE So WE TRIED TO RECOVER THE PHONE BY HOLDING DOWN THE HOME BUTTON AND PLUGGING IT IN TO ITUNES BUT THE PHONE HAS BEEN RECOVERING FOR TWO HOURS NOW! HOW LONG DOES THIS PROCESS TAKE?

How to get this iPhone off of lost mode?

My dad bought an iPhone 5 from someone but it's in lost mode and I don't know the pass code and neither does my dad. I tried to restore it on iTunes but it said It wouldn't work because it was on lost mode. Can someone tell me how to restore it and take lost mode off?