I have just received the news that today the Dutch regulatory authority sent us the final "ACK" for a GSM test license during HAR2009.
This means we can use four ARFCN in the GSM900 band, each with up to 100mW transmit power.
We also will be able to use certain GSM1800 channels, but then I expect almost nobody has equipment to make use of it.
I have created a GSM wiki page in the HAR2009 wiki for coordinating GSM related activities at the camp.
If you are a bit familiar with BS-11 and/or OpenBSC and you're at the camp, please let me know. We can use any help you might be able to provide.