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So it has not been news that some IOS developers use keychain items to track the uniqueness of devices through App reinstallation. Amazon is a huge one among them. What made my life particularly hard is that recently I migrated my old iPhone to a new one, but later decided to not erase the old one but to use both at the same time. And now all Amazon apps start to recognize both iPhones as the same device. So when I login my account on one device, the account on the other device would be logged out. And I can see only one entry on the amazon online portal for both devices. So the 'send to device' function of the kindle app won't work appropriately. There are also many other inconveniences due applications using keychain items for identification purposes, which I can't finish listing here, and for obvious reasons, none of the merchants could help us out in those situations on their end.

So the question is, are there anyway that we can somehow edit the local keychain items on the iPhone to stop (poorly designed) apps from mistreating different devices as the same one after system migration. Resetting or erasing the entire phone shouldn't be an option here.

Finally I want to say that I can't believe a company as large as Amazon is still relying on some undocumented behaviors for such basic functionalities in 2022. Is it hard to realize the huge security risks behind it? What a poor IOS software engineering team they have assembled....

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  • I think you have misunderstood something - why do you think that Amazon is relying on "undocumented behavior"? - The Keychain is quite extensively documented.
    – jksoegaard
    Sep 30, 2022 at 21:47
  • @jksoegaard I really don't see how "using keychain for uuid purposes" can be considered as "documented behavior". Remember the back and forth around IOS 10.3.
    – hzh
    Oct 1, 2022 at 20:57
  • No one said that this must be an “uuid” specifically. However having identifying information there is more or less the whole purpose of the Keychain. Of course that’s documented behavior.
    – jksoegaard
    Oct 1, 2022 at 21:42

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As you rule out resetting and/or erasting the entire phone, then no - there's no way on the phone you can edit the local Keychain items for such "poorly designed" apps that do not themselves provide that feature.

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