I've had an iPhone 4S for a year and a half and during that time, my son added many apps which he used. He now has own 4S. If he sets up his own Apple ID, can these apps be transferred over to him? -- from Apple Community

If you and your family members own different Apple IDs, and you want to share paid apps with each other's iPhones, you will get no luck. The paid apps are tied to the Apple ID that is used for buying them, so different apps with different Apple IDs can't be copied or moved within iTunes.

iCloud doesn't provide help here. Although you can upload apps to the cloud with your Apple ID and download the apps to the iPhone with different Apple ID, you probably won't want to do that because after you authorize that iPhone to use your Apple ID, the contents of the two iPhones will mess up.

You can use third party iPhone transfer software to transfer apps from iPhone to iPhone. I would like to introduce Leawo iTransfer to you. This software is used for transferring files among iOS deviecs, iTunes and PCs, and it allows users to transfer apps among iOS devices without the sync of iTunes. If you want to transfer apps from iPhone to iPhone without limits, Leawo iTransfer is a good choice. If you are interested, check out the following guidance about how to transfer apps from iPhone to iPhone. You are allowed to free download the software and have a try yourself, but the trial version has limited transfer times.

Download Leawo iTransfer

Tips: Leawo iTransfer only works with iTunes installed on your PC.

How to Transfer Apps from iPhone to iPhone

1. Launch Leawo iTransfer and connect the two iPhones. The software will automatically detect the contents in the iPhones and show the libraries of the two iDevices in the left sidebar.
Run Leawo iTransfer and Connect iPhones

2. Choose the iPhone that includes the apps you want to transfer. Click "Apps" of that iPhone library in the left sidebar. The apps will be shown in the right part. Click the transfer button at the right bottom of the window to transfer all the apps. Or hold "Ctrl" key and click to choose apps, and then right-click the chosen apps to "Transfer to > iPhone".
Select iPhone Apps to Transfer

3. After choosing apps, the dialog of transfer settings will pop up. Check "Transfer to List" and choose "iPhone" in the drop-down menu. Click "Transfer Now" at the right bottom of the dialog to start transferring apps from iPhone to iPhone.
Transfer Settings

When the transfer is ongoing, please don't disconnect the two iPhones. After the transfer process, you will find the apps in the other iPhone. Leawo iTransfer makes it easy for you to transfer apps among iOS devices, and if you want to transfer those apps to iTunes Library, you only need to choose "iTunes" in the drop-down menu in Step 3. Then you can backup those apps to iTunes library with ease.

Here is a post about how to backup iPhone apps, if you are interested, check it out. With Leawo iTransfer, you are able to get rid of the sync of iTunes. Leawo iTransfer enables you to transfer apps, music, movies, TV shows, ringtones, ebooks, photos and Camera Roll files with no effort, and it is helpful in our daily lives.