No what is the phones Operating system, you should not have gotten the Cable,
I would recommend you start to reaserach what phones [Manufactor and Operating Systems] can support Audio Line Out Natively or through software, unlike a DAP, a cell phone has to be told you run LINE out of the DAC. There for, you need to find the right phone and Software to use on that phone to get the Line Out to work properly. I can only hope the Phone and cable you purchased are compatiable, in addition you may need to reaserach what software to use on your phone to achive the Line Out Singal from the Dac
Or maybe the Cable will work all alone, but I have my doubts