The BES admin today was showing me some monitoring tool they were evaluating. You could look at a profile and it would tell you what technology the blackberry was using. (CDMA, iDEN, Mobitex, GPRS etc)
Prior: BES: 7510, 7520, 7290, 7230, 7130, 8220 (No Data Plan), Droid Eris
Post your question on the forum, don't PM me.