Hey guys!

Like somebody told in the bug report there is a tricky way to send USSD codes. I tried it on my device and it worked.

So here is how I did it:

1. Open X Terminal
2. Become root:
   sudo gainroot
   (requires the package "rootsh" to be installed BUT be REALLY careful what you do as root!)
3. Open connection to the modem:
   pnatd
4. Say hello to the modem
   at
5. Tell him to send the USSD code *135#
   at+cusd=1,"*135#",1
   But watch carefully what you type because you are not able to press backspace
6. Wait for reply
7. I did not find a way to disconnect from the modem, so simply tap at the blue X.

I attached a screenshot from my device, showing the reply.
In T-Mobile Germany the USSD code *135# simply shows your number.

Hope this helps!
It is not really comfortable but at least there is a way to send some USSD codes until the bug is fixed.