If I switch my iPhone, what will be saved? And what won't?

I cracked it super bad, and I think I'm getting a new one tomoz, but like I know if you take the SIM card out everything in your camera roll stays and contacts right?

But what about my music and photos/videos from inside the apps? Actually what about the apps? Do I have to get them all again? NO MY HIGH SCORES!)

Use Icloud. Sign in on the old device and back up the phone

On the new phone sign into icloud and everything will be back.

Just use your same apple ID

ICloud can work BUT most of us only have the 5gb account. Bet you have more stuff than that. Make a backup of your entire phone on iTunes before you go get the new one. When you set up the new one, use iTunes to import all of the old data onto the new. Game scores/levels, pics, music, whatever will cross over. No problems. Best luck.