If I cancel my iphone can I still use imessage on Wi-Fi?

So, if I cancel my cellphone service, then I lose my phone number and isn't the imessages sent according to phone number? How would I be able to send them?

I don't think you can. You can email to their phone number from your computer and it comes as a text to the person

No, you can't use iMessage.
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Yes, iMessage [&& text messaging is sent to phone number].
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No, the phone number is disabled in the text message server; you can no longer send or receive text messages.

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