Write an article based on this "Tap the Phone button on your J7. Dial *#06# on your phone. Copy down the IMEI number. Contact Samsung Support. Inform the customer service rep that you want to verify your IMEI. Give the IMEI number."
You can look up your J7's unique IMEI code, which you can then verify with Samsung. This will immediately pull up a window that displays your IMEI code. If this dial code doesn't do anything, you likely have a fake device. The number should be 14-15 digits long. You can start a live chat at samsung.com/support/ or call 1-800-SAMSUNG. Explain that you're concerned your device is fake. The support rep should be able to check to see if your device is genuine. You may have to wait for a reply.