Right then I've bought a RNS315 today as my mate was putting his car back to standard. Ideally wanted a 510 but it was a good price and it's a DAB unit. I've read that it's got built in Bluetooth does anybody know if there is a loom I can buy to fit the mic as my car didn't leave the factory with phone prep. I was going to buy a Bluetooth module and do it that way but after reading up online that isn't necessary with a 315. Any help is appreciated especially if somebody has done this before. Thanks