Scirocco Central

Hi all,
I was hoping someone could help with the answer to a question I am sure as been asked many times so apologies in advance.
I've just purchased a 2010 Scirocco GT TDi with the RCD510 unit. I want to connect my iphone by bluetooth (for calls) but from reading on here I believe the reason I cant connect is that I need an upgrade (module under drivers seat) When I push the phone button it just mutes the radio and there is nothing under the seat.
Could anyone let me know what I need to upgrade eg, module, wiring kit and what sort of price (I have someone who could fit) just looking at the cost and whats required for my model. (or point me in the direction of a previous thread that can help)
Many thanks for any help.
Cheers

This little thing connects to the MDI slot under your arm rest and emits Bluetooth whenever your vehicle is on. It connects automatically straight away and also allows calls still through the head unit and using the vehicle microphone

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