Forgot my iCloud username and password
I forget my Icloud user name and password my imei is model number is A1429 emc 2610
[Edited by Moderator]
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See -> If you can't connect or sign in to iCloud
If you can't connect or sign in to iCloud - Apple Support
BTW:
You are sign in here . . . with your Apple ID & Password.
Your Apple ID is the personal account you use with all Apple products and services. It includes the email address and password you use to sign in, as well as the contact, payment, and security details that you use with Apple.
You can’t merge multiple Apple ID accounts.