wrong!
you are wrong man ... see this article on how you can access blackberry services without data plan ..
cisco.com/en/US/solutions/collateral/ns340/ns394/ns348/ns772/networking_solution_solution_overview0900aecd806f4 3ca.pdf
it is clearly shown that it is possible to use all blackberry services with WIFI connection only WITH NO DATA PLAN. only u have to connect to blackberry infrastructure through some port ...
This is accomplished by
establishing an SSL connection via port 443 to the BlackBerry Infrastructure.
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