Mazuma Mobile will pay you cash for your mobile and send you a prepaid envelope to submit it.
While you’re not likely to make a fortune from that ageing small-screen phone — the starting price for some older models is just $1.60 — it makes more sense to cash in your phone (after deleting all your personal data) than leave it languishing in your drawer, and selling it to Mazuma is less hassle than flogging it on eBay or the like.