If you are looking for a used phone to buy, you need to check every aspect, starting from visual things and finishing on technical factors. The most popular models that people are buying from second hand are the iPhone, Apple devices. We already made a comprehensive article What to check before buying a used iPhone? We highly recommend this valuable article to avoid any mistakes that you may commit during purchase.
The most important thing that you really have to learn is Phone Blacklist Checker, where you will be able to check IMEI number Blacklist Status. Let's enter IMEI.INFO website to smoothly find Blacklist Status.
If you already find the blacklist status of your potential device and given information tells you that phone is existing on the blacklist. What does it mean? Phones marked as a blacklisted are listed on the blacklist database as devices that have been reported lost, stolen or the bills on it haven't been paid. It's mean that wireless carriers won't allow the phone to connect to the network connection even if using a valid SIM card. In a word, such a phone is useless, so if you are receiving information that phone is blacklisted, stop action and don't' make the purchase.