imessage
How to send iMessages on iPad without having own iPhone?
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You can use your AppleID email address, or any email address listed under your AppleID as an alternate email address. You just cannot use a cellular telephone number as a send from or receive at address without an iPhone.
That does mean you cannot send or receive SMS/MMS messages without a cell phone. But iMessage is not a cellular telephone messaging service - it is an internet messaging service and can use your AppleID email as the send from and receive at address,
See this support document - Set up iMessage on iPad - Apple Support