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I would like to get unique ID from mobile phone.I know IMEI code is unique but it is too long for me.I only want to get most 4 unique digit in mobile phone information.

dragullar
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  • Should this be unique across all the devices who has installed your app? – rakesh kashyap Aug 30 '16 at 02:45
  • Use a hash function and IMEI as argument. However, I wonder why only 4 digits... – Diego Torres Milano Aug 30 '16 at 03:47
  • Even using a hash on one of the long unique numbers you're _guaranteed_ to have duplicates after the first 9999 devices. In reality, you may get a duplicate on the 2nd device. So you'll need an approach to handle collisions. – scottt Aug 30 '16 at 06:18

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Android id is a unique String. You can use that.

Other way is using MAC. MAC address is also unique.It is 48bit lenghth. Use below method to get MAC.

WifiManager manager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiInfo info = manager.getConnectionInfo();
String address = info.getMacAddress();

If you want exactly 4 digit, you can use any commonly available hash algorithm.

Ruthwik Warrier
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