In the event that you want to check your warranty status, purchase accessories or find out the version of software that is running on your device, you will need to know your phone's model number. Whatever the reason may be, you can find the model number of your Samsung phone from the device itself.
How to find the model of your Samsung phone
Power down your Samsung phone and remove the battery cover.
Remove the battery from the phone and locate the sticker inside the battery compartment.
Locate the model number of your phone above the barcode on the sticker. Depending upon the carrier of your phone the model number will start with SCH, SPH or SGH.