Anybody that has the Viseeo MBU-1000 unit and is considering an iPhone 4 but worries about it being compatible should fear not. I've got both and was pleasantly delighted with the ease of use. I had fun and games with my old Nokia X6 as I had to import the contacts in batches manually. Simply switch on the bluetooth on your iPhone and set the Viseeo to sync and it will automatically load your contacts. It also updates each time you pair them together so no need to manually update.