Wirelessly posted (BlackBerry 8700g: BlackBerry8700/4.2.1 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)
Yes, once you install the 4.2 OS the BlackBerry Messenger should be an option to install.
I believe Telenav is a program you install on the BlackBerry to get directions. This uses the 8800's built-in GPS, which the 8700 does not have. By purchasing a bluetooth GPS device you can add GPS capabilities to the 8700c. I don't know if it will work with Telenav, as I haven't tried it. You can check Telenav's site to see, though.
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