How to Identify your device
You can find the model number for all iPhone devices in the settings. Go to Settings > General > About. To the right of Model, you'll see the model number. To see the model number that begins with the letter "A", simply tap on "Model Number".
If you can not access the settings, you can still find the model number engraved on the iPhone.
Most Androids devices have the model number located on the back of the device. If the model number of the device can not be found on the back of the device, it can also be found on the box of the device or by removing the battery of the device. You can also locate the device model number on all Android devices by going to the Settings or Options menu, scroll to the bottom of the list, and check ‘About phone’, ‘About device’ or similar. The device name and model number should be listed.