!!!! will an unlocked bb work on the bell network??!!!?

i saw a good deal on ebay for an unlocked blackberry curve 8900 and im currently on Bell Mobility. it says the bb will work on any GSM network, does that include bell? i dont know if bell is a gsm network or cdma, i really dont know the difference, but i was just wondering if i would be wasting my money on buying that unlocked bb then it not being able to work on the Bell network??
thanks in advance
wow....no ones answeringg... thanks