When you are buying insist for guarantee card, IMEI and ask them to provide their service center address.
Also try to buy from the vendor SD memory card that can support your device, cover, screen protector and the necessary power bank. Also check whether the device is Dual SIM or not and the type of SIM card it can accommodate. Once you had bought the device register it with the Samsung website.
Processor: 1.2GHz dual-core
Front Camera: 2-megapixel
OS: Android 4.4
Rear Camera: 5-megapixel
Battery Capacity: 1859mAh / Removable.
Samsung J5 Prime
Samsung J7 Prime