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    <p>There are some approach to get unique identifier on android phone.</p> <ol> <li><p>Android ID It is a 64-bit hex string which is generated on the device's first boot. Generally it won't changed unless is factory reset.</p> <p>Secure.getString(getContentResolver(), Secure.ANDROID_ID);</p></li> </ol> <p>The Android ID , considered unreliable because it can sometimes be null. The documentation states that it "can change upon factory reset". This string can also be altered on a rooted phone.</p> <pre><code> String m_szAndroidID = Secure.getString(getContentResolver(), Secure.ANDROID_ID); Returns: 9774d56d682e549c . No special permissions required. </code></pre> <p>2. The WLAN MAC Address string, is another unique identifier that you can use as a device id. Before you read it, you will need to make sure that your project has the android.permission.ACCESS_WIFI_STATE permission or the WLAN MAC Address will come up as null.</p> <pre><code> WifiManager wm = (WifiManager)getSystemService(Context.WIFI_SERVICE); String m_szWLANMAC = wm.getConnectionInfo().getMacAddress(); Returns: 00:11:22:33:44:55 (not a real address since this is a custom ROM , as you can see the MAC address can easily be faked). WLAN doesn't have to be on, to read this value. </code></pre> <p>3. The BT MAC Address string, available on Android devices with Bluetooth, can be read if your project has the android.permission.BLUETOOTH permission.</p> <pre><code> BluetoothAdapter m_BluetoothAdapter = null; // Local Bluetooth adapter m_BluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); String m_szBTMAC = m_BluetoothAdapter.getAddress(); </code></pre> <p>Returns: 43:25:78:50:93:38 . BT doesn't have to be on, to read it. 4. IMEI only for Android devices with Phone use:</p> <pre><code> TelephonyManager TelephonyMgr = (TelephonyManager)getSystemService(TELEPHONY_SERVICE); String szImei = TelephonyMgr.getDeviceId(); // Requires READ_PHONE_STATE </code></pre> <p>This requires adding a permission in AndroidManifest.xml, and users will be notified upon installing your software: android.permission.READ_PHONE_STATE. The IMEI is unique for your phone and it looks like this: 359881030314356 (unless you have a pre-production device with an invalid IMEI like 0000000000000). For more info <a href="http://www.pocketmagic.net/?p=1662" rel="nofollow">refer</a> this link.</p>
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