My Iphone is broke and can't fix it any suggestions?

I got my Iphone at Christmas and it was working fine and then my brother cracked the screen. It was still working fine and then a couple days ago it started chipping on the top and now all of the glass above the screen is gone. When that happened my touch on my screen like went away and now I can sometimes touch some places and it works but for the most time when I touch it, it doesn't work. I need to know if I should spend a whole another 200 and get it fixed or If I can find any way to fix it thank you!

IPhone isn't letting me text?

Recently this morning, I texted one of my friends that has an iPhone (iMessage, Blue and gray) and it went through (the text), and I also texted another friend which doesn't have an iPhone (Green and gray text) and the 'Message Send Failure' pops up. I tried to resend it but it didn't work. I also tried to power off and on but that didn't work either.

How to stop someone calling me?

Okay so my ex boyfriend won't leave me alone. He keeps calling and texting me and it is so annoying. I don't want advice as to how to make him stop, I want to know if I can block his number on my iPhone. It's an iPhone 4S, an it's not jailbroken, its on the carrier Orange. Are there any apps or downloads to do it?