If you don't know what does BIS or BES mean on BlackBerry, here is the explanation.
BIS is standing from BlackBerry Internet Service, means an internet service that provided by the respective carrier, for example, it could be T-Mobile, AT&T, Verizon, Vodafone, Rogers, and many more.
Meanwhile, BES is standing from BlackBerry Enterprise Server, which an internet service that provided by a company's server. It can be from your SIM Card hostler or your employeer.
