when I bought my 05 Tl it also came with isimple and I did not know what it was but after doing some research I found out.The thing is I dont own a ipod or iphone and I was wondering if there were some kind of adapter that wound work with my htc phone.

 

there should be an ipod/iphone adapter as well as a 3.5mm jack.

 

3.5mm jack comes with another cable and would be plugged into a different output on the control module.

If it was installed by the previous owner he may have not included the 3.5mm aux cable as well.