Martin Cartledge

Hi all, I have just bought a 2005 A4 Convertible 1.8 sport (i think). I absolutely love the car and its in great nick. I have 3 initial questions really if I may. I have already tried to search for answers to these but don't really find a conclusive answer. 1) The multimedia screen has an option for a phone. How can i go about this recognising my phone. Ideally through bluetooth but wired would be good too. Im guessing this option is not 'live' on my car but isothere a relatively simple ay to make it work? 2) How do i upgrade the sat nav? I have read about making sure i have a relatively new software version the buying a new disc, but i can't conclusively find all the steps i might need to take. Is there a guide anywhere? Also when selecting a destination it doesn't accept all of the postcode. If for example I'm trying to navigate to HP5 1YQ, it only allows me to put in HP5 1. This is a wide area. I realise that it then asks for road name, but what if i don't know it? Does the upgrade get round this issue? 3) Lastly there seems to be a whooshing sound if i accelerate hard. I have read some comments saying that this might be gearbox fluid needing topping up. It doesn't seem to affect performance but is more annoying than anything. Anyone with experience with this and does anyone know how to check the fluid levels of the gearbox? Thanks so much for anyone that attempts to answer my newbie questions. Really happy to be part of what seems a great community! Oh and i love the car! Thanks all Martin