What happens if i plug my iphone4 into my computer?

Since I've gotten my iPhone 4 I've never plugged it into my laptop, so my phone has all my photo, videos, contacts etc… I've downloaded iTunes onto my laptop and basically downloaded all my songs with iCloud, so I'm afraid that if i plug my phone into my laptop it will delete everything on my phone…

No you will not delete anything if is safe to plug your i phone in to your computer.

Nothing will happen if you have those songs in your computer, but if you don't have then they will either be put into the computer or erased

  • Why does my iPhone do this when I plug it into my computer? Whenever I plug my iPhone into my comuter, the same 5 songs get taken off of one of my playlists, automatically. It doesn't do that with my iPod, so why is it doing this with my iPhone?
  • What will happen if I plug my new iPhone into my computer? I've had an iPod for a very long time and I have all of my music currently on my iTunes. I just recently bought an iPhone and I wanted to add some tones and various music to it. Will my music be okay if I plug my iPhone into my computer?
  • What will happen if i plug my iphone into a different computer? My computer is beyond repair and i want to download some songs that aren't available on itunes, so i was going to use my sisters computer.but, she also has an iphone. if i were to plug my phone into the computer's guest account, would it affect her music library? like, would it be deleted? i don't mind that mine would be wiped off, i can just re-download them, but yeah.
  • What happens if I plug my iPhone 4 into a new MacBook Pro? I'm about to buy a new MacBook Pro and I want to plug my iPhone into it. The only problem is that I'm worried everything on my phone will be wiped out. If I plug my iPhone into the computer what will happen?