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Did you specifically tell Vodafone you were using a Note 8 by registering the IMEI code when you got the sim free phone? If not then there is no way Vodafone can confirm for you that you were.
Sorry for the delay in getting back to you. Cookie is correct in advising that unless you registered the IMEI with us, we would be unable to verify this for the insurance company. If you did register it, please send on your account details by private message.