Samsung Galaxy series is one of the most successful smartphone series because of which many fake companies manufacture replicas that may look like galaxy but can’t perform like a galaxy smartphone.
The display screen of the galaxy smartphone is AMOLED while in fake galaxy smartphones the display screen can be easily detected because of low resolution.
You can also detect whether the smartphone is real or not by using a code *#7353#, when you dial this code on original galaxy smartphone a special menu is opened with settings for camera, volume and other applications.
You can also confirm the originality by checking the serial number and IMEI number. Check this by dialing *#06# which will show the IMEI and serial number now write down these numbers and remove the battery of the mobile, and match these numbers with those on the back of the mobile.