There are some social groups in which everyone uses BBM as the de facto messaging service. Some carriers offer plans with unlimited BBM messaging but limited (o

There are some social groups in which everyone uses BBM as the de facto messaging service. Some carriers offer plans with unlimited BBM messaging but limited (or expensive) data and/or SMS. Additionally, peer pressure and indifference to change may be a factor (if all the cool people you know are using BBM, why should anyone switch?)