How do I find the serial number for my Android device?

TelephonyManager tManager = (TelephonyManager)myActivity.getSystemService(Context.TELEPHONY_SERVICE);
String uid = tManager.getDeviceId();

getSystemService is the method included in the Activity class. The getDeviceID() method will return a different MDN or MEID value depending on which radio the instrument uses (GSM or CDMA).

Each device must return a unique value (assuming that the device is a phone). If you have an Android device with Sim slot or CDMA radio, the above method will definitely work. If it's an Android device that powers on with Microwave, you have to solve it yourself.