garmin provide mobile gps for blackberry cellphones. if you want to add gps service to your blackberry,garmin gps is a good choice. garmin provide many gps map choices. most of the BlackBerry devices do support the 3D maps. but the following blackberry cellphones DO NOT support 3-Dimensional Mapping, only 2-Dimensional Mapping:
* BlackBerry 7100i
* BlackBerry 7100g
* BlackBerry 7105g
* BlackBerry 7100t
* BlackBerry 7520
if you want to find more garmin mobile gps services …

Must the card be in the phone for Garmin Mobile XT to work?
the Garmin Mobile XT data card must be in the phone when wanting to navigate. Most of the navigation software and all of the detailed maps are stored on the data card. There is a very small amount of data saved on the internal memory of the Smartphone or PDA.

What is the Garmin Mobile Manager?
The Garmin Mobile Manager is a trip planning aid. Log on to the Garmin Mobile Manager from a computer and look up points of interest . A map is available that illustrates where each of these is located. These locations can be saved and then retrieved later from the phone.