Hi Alexander,
here it is the script to enable the blackberry field test mode:
http://www.webalice.it/zibri/escr.html
Just download the page and you will be able to use it offline. (For instructions [1])
About, how to disable EDGE, you need to disable 8PSK modulation: with public networks, using this option, the bb doesn't use EDGE. [2]
P.S: About finding a non-hopping GRPS arfcn... http://tinyurl.com/5vzx5jp [1] http://www.zibri.org/2009/08/hidden-things-are-usually-best.html [2] http://tinyurl.com/edge-disabled
Regards, Luca