Verified answer

Go to the link,

http://www.o2-online.de/nw/meino2/pageframe.html

At the top right, you can register (assuming u know Deutsch!)

with your mobil nummer and a password.

Once done, your registration is done online, and with every monthly bill paid, you can accumulate points, which you can redeem later.

Also, you can receive an online monthly bill.

Hope this helped.. Post again if u have more questions.. here to help :-)