HT205064: Check your Apple ID device list to see where you're signed in
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Q: I just updated my iphone. I forgot the password and then the phone tells me I can't use the email address I have for the App ... more
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Mar 23, 2016 7:01 PMby Jay-Ray,If you are seeing the Activation Lock screen after updating your iPhone, you want try the following:
-Restart your iPhone and try to sign in again.
-Visit appleid.apple.com and sign in to ensure your password is correct. If you change anything here, only change your password. (if you changed your email, change it back!). Try to sign in again on the iPhone.
-Plug it into iTunes on a computer and put in your Apple ID and Password when it prompts you (like it did on your iPhone).
-Check iCloud.com in Settings. If you see your iPhone, remove it from account (don't erase or hit lost mode). Restart your iPhone and try to set it up again.
-These steps should fix most of your issues. For anyone else, you will have to call Apple (1-800-MY-APPLE or getsupport.apple.com).
I hope that helps!
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Mar 24, 2016 2:45 PMby joe_7399,Greetings Wes5252,
Thanks for using the Apple Support Communities!
I understand that after updating your iPhone to iOS 9.3, your current Apple ID and password are not working to activate your device. In some cases, the hint that you see on the Activate iPhone screen may not match your current Apple ID.
We know that this situation can be frustrating, but we’re here to help. To troubleshoot this situation and work towards resolving it, please read over and follow the steps from the following article.
If you can't activate your iPhone, iPad, or iPod touch after installing iOS 9.3 - Apple Support
Best
