Why my phone can’t create new Apple ID

If you see a Could Not Create Apple ID or Could Not Set Up iCloud message - Apple Support

oladepo129 Said:

"I want to ask why my iPhone is saying I can’t open a new iCloud"

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Use a Different Device?:

There is a limit of 5 Apple IDs you can create per device. So, if you have already created 5 Apple IDs through this device, then you cannot go any further. So, do so using another device --typically one that has not already been used to create 5 Apple IDs.