RIM's Blackberry is very secure

Rim’s Blackberry Enterprise Server (BES) is one of the most sophisticated platforms for email and PIN messages. This system used to be the domain of big corporations. No longer. One of the reasons many financial brokerage institutions ban the use of PIN messages is because they can’t be tracked. In 2005 this was big news and was reported widely. Canadian Imperial Bank of Commerce (CIBC) and Royal Bank of Canada (RBC) banned its use. Organized crime picked up where the banks left off.