Sure, Vishal.
In the web interface, I clicked to create a display-only campaign, checked "No marketing objective", scrolled down and under "Advanced settings" I toggled-open the "Device: target selected mobile devices and tablets" option. Then --> Edit --> Device models --> Let me choose... --> Android --> Samsung, and here, there are only 337 devices.
Through the API, using the ConstantDataService, I ran the method getMobileDeviceCriterion() and got all the devices. And after I extracted the manufacturer and the device model for each, and sorted them, I could easily count all the Samsung devices, and they are 642.
Thank you.