Gazelle - Buy and Sell your used cell phones and electronics. Sell your iPhone, Samsung Galaxy, iPad and more for cash, or buy used iPhones, iPads and other cell phones. More than one million customers trust Gazelle.

Marketo - Marketo's powerful marketing automation software helps marketers master the art & science of digital marketing to engage customers and prospects.

Cashify - Cashify has earned a good fame and name in the field of used smartphones, tablets, and laptops.

Constant Contact - Constant Contact offers email marketing, social media marketing, online survey, event marketing, digital storefronts, and local deals tools.

CashOn Pick - Cellular Country is not as greater used smartphones trading platforms as compared to others, but still, there are many factors that make it the best platform for getting used smartphones and also selling used or second-hand smartphones as well.

Omnisend - Omnisend - Marketing Automation for Ecommerce provides the omnichannel approach for sales-driven marketers that have outgrown the generic email marketing platforms.