It comes with blackberry. The sim card has nothing to do with it. Nextel push to talk(direct connect) also has nothing to do with BBM. Totally different things.
I know but do you have to pay for a Blackberry service in order to get BBM?
Because a guy at work told me that if I buy a Blackberry Nextel, I can use the nextel and phone features, but none of the internet, email, etc... But I am not sure if that includes texting with BBM.