Security on a cell network for data is very high. The sending device may change channels many times and the "snooper" would have to have the equipment to follow the signal change. As for unsecured WIFI, you open up to a large range of possible issues. Just about all companys use VPN connections to exchange data with a laptop.
I dont know of a VPN application on a BB but one may exist. I know my company would not connect to a BB via WIFI. They only talk via the standard methods. All data is encrypted as a standard .
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Z10 on BES
Z10 on BIS
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