In 2007, Gazelle brought the idea of using cell phones, tablets and other devices for cash. Today, in 2020 all the brands from Target, Costco, Walmart to Amazon do the same.
The customers have to follow the online process of answering certain questions. They get a quote after which they can choose to ship their used phone to the brand and receive a gift card from them. There are so many avenues these days that do the same.
One can compare the prices online and get the exchange done within a few clicks. For instance if you are looking at trading your old iPhone X (64GB), you are offered $205 by AT&T, $216 by Gazelle, and $196 by Target.
The difference in prices become bigger when the phone is older or comparatively less popular. Like for instance the Samsung Galaxy Note 8 which if is 2 years old is considered of no worth by AT&T, Target offers $76, while Gazelle can give something around $141.
A quick online comparison will get you the price you are looking for. You can choose to have your favorites or simply compare the phone on random platforms. There are so many old tech buying sources these days. It no longer is one company or some 2 people in the market offering a single price that you have to eventually agree on as there is no other place to sell it.
Today the list is too long to be listed. In 2020, it is estimated that 1.5 billion phones will be sold worldwide. The market for used phones is going great as everyone needs a phone but everyone cannot afford the expensive ones. So they buy the used but the popular ones from the used phones market.