Originally Posted by aiharkness
Understand, it's not free. You wouldn't be paying for it, but ultimately someone is paying for it. You or a few people doing it may be insignificant. But widespread adoption of that practice would end up costing the paying customers in higher fees.
Your blackberry data is going out over wifi which appears free to you. But the blackberry messenger data goes through RIM's network, which is being paid for by paying blackberry data customers.
You are correct Ira when taking the big picture view of it. The small picture view is if a few people do this then it's basically 'free'. I have a feeling if original owner cancels their BB account the 'fake' BB may still work but I cannot confirm this. Basically it's just a neat little trick to do if you want to BBM from home/work/school. Not really that useful if you travel a lot since it's hard to find a WIFI signal sometimes.