Hello
I have an iPhone 6 Plus 128GB
Unfortunately, after restarting my phone, I'm on the activation page and asking me for an iPad id
I lost the id and I do not remember at all
What should I do
I have a carton and a handset
iPhone 6 Plus, iOS 11.2.6
Have you tried : If you forgot your Apple ID - Apple Support ?
Or, and if you were the original purchaser of the phone (i.e. it wasn’t bought used), you could try going to an Apple Store (make a Genius Bar appointment if you do) or try contacting iTunes Support online (https://www.apple.com/emea/support/itunes/contact.html) and see if they can remove the phone from the account - they are likely to want to see proof of ownership before they might help e.g. original receipt with the serial number on it
iphone 6plus
