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I changed the email address for my Apple ID. &nbsp;On my phone, the old email address still appears. &nbsp;If I log out of the old Apple ID, I get a message that photos and other content will be removed from the phone. &nbsp;If I log back in using the new Apple ID, will all of my content return to the phone. &nbsp;(I do have the phone backed up in iCloud.)
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I changed the email address for my Apple ID.  On my phone, the old email address still appears.  If I log out of the old Apple ID, I get a message that photos and other content will be removed from the phone.  If I log back in using the new Apple ID, will all of my content return to the phone.  (I do have the phone backed up in iCloud.)

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You are very welcome and I was happy to help.
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You are very welcome and I was happy to help.

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My Apple ID is an email address that I will soon no longer have access to. &nbsp;Can I still use the defunct email address as the Apple ID, or do I need to change my Apple ID to use my new email address?
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My Apple ID is an email address that I will soon no longer have access to.  Can I still use the defunct email address as the Apple ID, or do I need to change my Apple ID to use my new email address?

Changing Apple ID due to defunct email address

Apple's early computers ran on a variety of operating systems, including a Pascal version and one based on CP/M, before releasing its ProDOS with the advent of its 16-bit computer. With the release of the Lisa, which had its own OS, Apple and computing entered the graphical age; it was followed by the Macintosh, which offered a series of "System" operating systems. Other Mac operating systems included PowerPC until Apple acquired NeXT and folded it into the Mac OS. Current operating systems for Apple devices are Mac OS-X and iOS.