How to change your Apple ID on an iPhone

If you stop using your Apple ID's email address, you can change it on your iPhone to protect your account and continue using ...
Fast Company

Apple finally lets you merge 2 Apple IDs—kinda. Here’s how

Anyone with more than one Apple ID knows how frustrating things can get. Now you can do something about it. A few years ago, I chronicled the journey I went on to manually merge two Apple ID accounts ...
Ars Technica

Help me reconcile my MobileMe/iCloud ID with my AppleID

Meanwhile I have purchased years of music from the iTunes Music Store using my Apple ID. Now Mobile Me is gone and my MobileMe ID has become an iCloud ID with 25GB storage. My AppleID has also become ...