Find serial number of old phone
Where can I find the serial number of a iPhone I no longer have?
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That depends partially on why you need it. If it is for the slowdown settlement when you register with the site it has a search option to find eligible devices.
For all other purposes, from the receipt, from the original box, if you synced it to iTunes from iTunes Preferences/Devices - right click on the backup. And if you never deleted it from your account, log in to https://appleid.apple.com and click on the link under the devices.