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?

It updates and syncs!

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Certain things are part of your profile. This includes purchased apps, calendars, and contacts (if you're using iCloud or another cloud calendar provider). All of this stuff will sync with your new computer. In addition, any songs you purchased on iTunes will be synced to the new computer. Due to licensing concerns, Apple is not able to transfer songs obtained from places other than iTunes so you'll have to copy those over manually if you want to keep them. Or, even better in my opinion, is to use Amazon Cloud Drive or Google Music to keep all of your songs synced to the cloud.

An iPhone can be synced with only one iTunes account at a time.once you switched to a new iTunes account or a new computer. You have to authorize your iPhone to it at first, then you can upload music and video from the new iTunes to your iPhone. But this way will overwrite the original files on iPhone with the new iTunes. You may try this iPhone transfer, it can help you copy files from iPhone to computer for backup, you can also use it as an iTunes alternative to upload music and video. It will not erase your original iPhone files. It's safe and works pretty well for me.
http://www.msplinks.com/MDFodHRwOi8vd3d3LjAwMS1zb2Z0d2FyZS5jb20vaXRyYW5zZmVyLw==

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