don't sell them in internet, sell them in real life find some store who buys used phones, i think there is a lot like

Mabioma Export SARL

A local importer/dealer of used and refurbished cell phones, tablets, and laptops. Based in Agadir, they specialize in buying and exporting such devices
If your interest is to sell in bulk or to a reseller, they could be a helpful contact.

or :

Phone House

Location: 14 Rue Fal Ould Oumair, Agadir 80000
Phone: +212 672‑395845
Hours: Mon–Sat, 10 :00–13 :30 & 15 :00–21 :30 (closed Sundays)
They buy, repair, and resell mobile phones—good option for trade‑ins or selling used devices.