The second great news for you is that you can copy iTune Media files into your iPhone even a licensed version. You just need to follow the 6 Golden Steps :
Step No. 1
Open iTunes on the computer and Simply by going to Store > Authorize Computer, Allow iTunes to get your account details. which will be different from current.
Step No. 2
Click the “Authorize” button after submitting your required iTunes to any of your desired computer. Because there can be more than one free computer attached with yours. (normally allows upto 5)
Step No. 3
Then After connecting the iPhone which holds the apps that you want to get to iTunes. select “Transfer Purchases” in the iPhone icon. Do not allow iPhone to update, restore or backup, if asked after connecting to the iPhone.
Step No. 4
Hopefully you will get some option like “Sync in Progress” then you data will be copied in the iTunes window. The copying process depends on your data`s weight.
Step No. 5
After the completion of transfer, change the iPhone with the other one. in which you want to copy the iTunes.
Step No. 6
Select the Application which you copied from previous iPhone. Click “Sync” and then you can get your desired application in your iPhone.
So these are some simple 6 steps for your excitement. http://tiny.cc/CopyiPhoneApps