Sync two iPhones on one computer

Sync two iPhones on one computer
On the Summary tab, make sure that the guest phone's Options are set so that the phone does not sync with this library automatically. Just as important, make sure the box for "Manually Manage Music and Video" is checked. Next, click through the tabs at the top to make sure nothing is selected to sync with the device -- no apps, no music, no videos, photos, books, nor contacts. Nothing. Then hit the Apply button in the bottom-right corner. Always make sure your iPhone content is backed up somewhere before attempting to sync your phone with a new iTunes library.Screenshot by Donald Bell/CNETNow, if this is the first time you've tried connecting this device to this iTunes library, you may get a warning that the phone was originally set up to be used with another computer and that you're about to erase this phone and sync it with content from this library. That's some heavy language, and if it scares you too much, just stop. No Led Zeppelin bootleg is worth it. But since what we're really doing here is freeing this thing up to sync media manually, and we checked that no apps or info or other settings are being synced to this phone, you should be able to take the take the leap with little or no consequence. Of course, it couldn't hurt to make sure your data, photos, and media are backed up before messing around.Finally, now that the phone is set up for manual syncing, you should be able to drag any music or video content from your library and drop it right on the phone's icon to sync it over. That's all there is to it.To see the process unfold, check out my demonstration video on CNET TV.