Follow 2 simple steps:
1. Open the Settings app, and go to General > About.
2. In the top, you'll see Model Name.
For Android (Samsung):
1. Click the Menu button and select System Settings.
2. Scroll down through the list and tap About Phone. That's your model!
If you're still unsure of what type of model phone you have, reach out at: firstname.lastname@example.org