How to get the device's IMEI/ESN programmatically in android?

Question

To identify each devices uniquely I would like to use the IMEI (or ESN number for CDMA devices). How to access this programmatically?

Answer 1

As in API 26 getDeviceId() is depreciated so you can use following code to cater API 26 and earlier versions

TelephonyManager telephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
String imei="";
if (android.os.Build.VERSION.SDK_INT >= 26) {
  imei=telephonyManager.getImei();
}
else
{
  imei=telephonyManager.getDeviceId();
}

Don't forget to add permission requests for READ_PHONE_STATE to use the above code.

UPDATE: From Android 10 its is restricted for user apps to get non-resettable hardware identifiers like IMEI.