Transfering music and apps from my old phone too my Mac

Question

i bought my iphone last year its the 3g. i have an apple account which i use on both my Mac and iphone. but the problem is im getting a new iphone the 3Gs and i don't know how to get my apps and music thats on my phone to my Mac. my iphone is currently sinked to another computer.
but i want to sink my new phone to my Mac. how do i get all my apps and music from my old phone, that is from the same account, on my Mac and new phone?
Thanks
Jenna

Answer 1

Sync to the old computer, and to be safe select iTunes > File menu > Transfer Purchases From so all the content is in the old iTunes library. Then, move the iTunes library from the old computer to the new computer - you'll need something +other than the iPhone+ for that (external HDD, flash drive, burn DVDs, etc.). Authorize the new computer in iTunes and sign into your account. Also, move your iPhone backup to the new computer. It's located:
On a Mac: ~/Library/Application Support/MobileSync/Backup/
On Windows XP: \Documents and Settings\(username)\Application Data\Apple Computer\MobileSync\Backup\
On Windows Vista: \Users\(username)\AppData\Roaming\Apple Computer\MobileSync\Backup\
Copy it to the correct location for the Mac. If the MobileSync/Backup folder does not exist, create it.
When you sync the new phone to the new computer, you will be prompted to set up that phone using the backup of the previous phone, and all your content and settings (except WiFi passwords for security reasons) will be transferred.