wajdis

I guess you are trying to do the MD5 yourself, while you should simply just enter the mac address with the : . The script will automatically generate the hash for u.

No, simple enter your number without + and the mac address once with the two points, just like XX:XX:XX:XX:XX:XX

What's ur device ? (Android or iOS ?)

The IMEI is harder, but any one who can grap your phone can enter *#06# to get your IMEI. Also, it's available on the box of your device, and many apps store the IMEI to identify your device.

I don't store anything.

Thanks for the note, It's the name that show in Push notifications on iOS and Windows devices.