Someone can't use an iPhone because they're juggling Apple IDs?
First, it supports multiple IDs, the limit is one ID per storefront or sync.
Second, if this isn't about multiple IDs but about multiple addresses for a single ID, and if you don't like it supporting the old addresses, go to http://appleid.apple.com and manage them. You can update, edit, and remove old email addresses, decide what your primary one is, etc. I find it helpful to ensure 100% of all services across all devices are using the same exact ID aka email address; one way to enforce this is to be sure your appleID account only has one listed.
On the other hand, if she has inadvertently created multiple IDs over the years, she needs to either settle on one ID per service (my wife has one for music, one for apps, one for iCloud), or she needs to ditch the extra ones and standardize on a single one.
To tell if they're the same or multiple accounts, again, go to http://appleid.apple.com/ and log in with the one you think is the master, be sure the others are listed. If not, they're separate IDs.
None of this stops her from using her phone. Conveniently, all these phones fine with or without the ID.
FWIW, on my Galaxy Nexus I find managing multiple Google Accounts and cloud data sync more precarious. Sure, there's an easy radio button to pick accounts in the Google Play store, for example, but once I made sure I'm using the same ID across devices I've never had a bookmarks, contacts, calendar, or messages sync issue with iCloud, while I am having to go in and reset sync settings for bookmarks, contacts, etc., every couple weeks on Jellybean. And I usually don't know the sync is broken again until I notice something's missing, check sync settings, and see the broken sync alert.
She doesn't use multiple IDs. She only uses one. But in order to make things work, she has tried everything in the book, including trying to sign into her old account when this stupid bug pops up.
And no, she can't use the phone as it was advertised. She has multiple apps that use iCloud for storage, and every time this happens, she just stops using the apps, as it can literally take hours of trying before she can successfully sign into iCloud.
> She doesn't use multiple IDs. But... trying to sign into her old account...
Sounds like more than one. She needs to quit using the phone with "old" IDs, she's confusing herself and the device.
Get logged into https://appleid.apple.com/ and get it sorted out there. If you can't log into that, get on phone with Apple support until you can. As long as you didn't two step auth it, the phone support can and will help.
I'm not trying to debate, btw, I'm trying to legitimately help. Like most of us here, we end up being the support person for our family's devices, and I have seen people get themselves in a jam w/ the ID before. Clearly defining the Primary Apple ID won't be resolved until it's clearly resolved in the web interface.
First, it supports multiple IDs, the limit is one ID per storefront or sync.
Second, if this isn't about multiple IDs but about multiple addresses for a single ID, and if you don't like it supporting the old addresses, go to http://appleid.apple.com and manage them. You can update, edit, and remove old email addresses, decide what your primary one is, etc. I find it helpful to ensure 100% of all services across all devices are using the same exact ID aka email address; one way to enforce this is to be sure your appleID account only has one listed.
On the other hand, if she has inadvertently created multiple IDs over the years, she needs to either settle on one ID per service (my wife has one for music, one for apps, one for iCloud), or she needs to ditch the extra ones and standardize on a single one.
To tell if they're the same or multiple accounts, again, go to http://appleid.apple.com/ and log in with the one you think is the master, be sure the others are listed. If not, they're separate IDs.
None of this stops her from using her phone. Conveniently, all these phones fine with or without the ID.
FWIW, on my Galaxy Nexus I find managing multiple Google Accounts and cloud data sync more precarious. Sure, there's an easy radio button to pick accounts in the Google Play store, for example, but once I made sure I'm using the same ID across devices I've never had a bookmarks, contacts, calendar, or messages sync issue with iCloud, while I am having to go in and reset sync settings for bookmarks, contacts, etc., every couple weeks on Jellybean. And I usually don't know the sync is broken again until I notice something's missing, check sync settings, and see the broken sync alert.