Can I use an unlocked blackberry 8900 with boost mobile service?

it all depends on the network that the black berry runs on…like there are the same models of phones on both networks…take verizon and att for example…they both have motorola razr’s and blackberry curves and such but the insides are what matter…like NO MATTER WHAT PEOPLE TELL YOU…iPhone’s won’t work on verizon’s network because verizon runs on CDMA while ATT runs on GSM…two different types of connections…also if it requires a sim card and boost mobile requires one…then that will cause a problem…hope all of this mess of an answer helps :) good luck

I think you cant…