iPhone trade-in deals: How and where to get the most cash for your old iPhone

Techvarium

It also helps to sell your old iPhone on better paying websites like Swapa or CellCahier. Some websites offer better quotes than quotes you would receive from your phone carrier. I sold my old Verizon iPhone 6 for $420 right before the iPhone 6s came out, so I only had to pay about $250 extra for the new iPhone 6s when it came out.