Would My o2 SIM Card Work In A Blackberry Which Has Been UNLOCKED?

So, I got a 24 month contract with my iPhone 3G back in March 2OO9.

And I was just wondering, If I bought a Blackberry and put my o2 SIM card in would it work for -

Internet?
E-mail
MMS?
Phone calls?
BB Pin? .. etc .. etc ..

Ya sure the o2 sim will work in the blackberry mobile since it is unlocked one else if the blackberry mobile is locked to some other network provider then it wont accept o2 sim until you unlock it ..You can easily unlock the phone through online providers like UnBBLock.com here they are rendering network unlock code for all blackberry mobile models at reliable cost ....