Question

In what ways can I call for an android app to detect what phone I’m using (like specific model number) in Java?

Answer 1

This should work, if you want to display “the end-user-visible name for the end product”(the docs)
:

String mDeviceModel = android.os.Build.MODEL;

For the industrial name:

String mDeviceName = android.os.Build.DEVICE;

To get the Manufacturer:

String mDeviceManufacturer = android.os.Build.MANUFACTURER;