How do i return the phone i upgraded from
How do I return a phone I upgraded from
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If the phone was a "trade-in" on a new iPhone,
Check your trade-in confirmation email for the details of how to return your device,
(maybe by courier or dropping off at an eligible location.) There may be a time limit.
seems Apple generally send packaging in which you can return the older iPhone.
How to prepare your iPhone, Apple Watch, or Android for trade-in - Apple Support
Also scroll down in above linked article to see: "Pack your iPhone" for detailed instructions,
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If needed:
You might want to check if you have a tech support case ID, ... perhaps in an e-mail from Apple ?
There is a link on this Apple Support page "to see your cases or repairs"
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Else: If needed: As you have a new iPhone:
One stop for technical support, Apple hardware service, and software support.
Call Apple Support at 1-800-APLCARE (or use the app)
or
Apple phone numbers around the world
Contact Apple for support and service - Apple Support
All the best :-)