Secondhand Mobile is an Android app developed by SmileApp, designed to be a useful tool for interaction between customers and the company. The app offers several features that allow registered customers to enjoy special offers and tailored products and services.

The app features a loyalty card program that allows customers to accumulate points for every purchase, phone recharge, or new phone number rechargeable activated or brought from another manager. These points can be redeemed for great prizes that will be published on the company's website accessible directly from the app.

Another feature of the app is the evaluation of used smartphones. Customers can know the company's evaluation of their smartphones at all times and decide to change their devices with another. The pricing varies according to the conditions of the phone, such as excellent, good, medium, or poor.

The app also features a showcase charity section where customers can check the availability of special occasions (both tablet and smartphones) and calculate the difference due to change their devices with another.