What car do you have?
Never heard of volki, the common/genuine one is 9W7. It can do voice control, i.e. "Call John Johnson on Mobile", but not composing SMS message via voice (your smartphone should be able to do that on its own). If you get an A2DP app for Android you can have the car read out your SMS messages when in the car.
9WZ on the other hand can let you compose SMS messages on the RNS510 but your phone has to support RSAP, and if you use this mode your phones' Internet access is disabled.
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