how do i know if my iphone has been erased

If it's been properly erased, it will start up to the "Hello" screen when it's turned on.

healy100-4 Said:

"how do I know if my iPhone has been erased”

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What makes you ask?

Is this a used iPhone? If so, then if would have been erased (if the seller knew better).

If purchased from Apple, then no worries there.