Just took delivery of a new GLK and paired my wife's LG env3 to it. The address book did not sync with the car, and reading more about this online, it appears the GLK does not support address book downloading. Am I missing something?

 

Try reading again and avoid posts that say it doesn't. If you mean your LG phone is not compatible with the MB head unit, that may be a different thing but I would double check that too.

Did you read the HU manual?