I have a 2003 745i that I would like to purchase the BTUM for. I currently have a Samsung A900 (Samsung version of the Motorola Razr). I know there is an approved list of phones to use with the BTUM, but I am in a 2 year contract with sprint and just want to know if anyone has used this combination with success, or have they had issues. Thanks any info would be helpful before I make the BTUM purchase.