Default [Q] Mobage Device Registration

I play the Mobage game Fantasica. Mobage forces you to register your device to the account in order to do many important things in the games. I have been trying to figure out a way to fool this process to register to a new account. I know that on the youwave emulator you could fool this by entering into the terminal emulator:

cd sdcard
echo "random 15 digit number" >id
su
reboot

I have a rooted tablet, and tried using Titanium backup pro to changed the android id first. This didn't work. Next, I tried the above commands in a terminal emulator on the tablet. That didn't work either.

I'm wondering if Mobage is no longer using the same marker as the target for device registration, and if they aren't, what are they using now? Or am I doing something wrong.

Thanks!