You need a blackberry data plan, not only a data plan.
Also, the seviceprovider you choose must not disable blackberry maps. Before ordering a blackberry data plan, ask them if blackberry maps is supported/availible.

If you go in the options/settings von the blackberry main screen, the, advanced, then: service books: what servicebooks are listed ?

The blackberrymaps (lbsconfig) is the service book, which is needed for bbmaps.

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