Read about the Fiio E10 here to answer questions before they even form.
To catch you up, the E10 is a
USB DAC/AMP, it connects via USB. Your phone and ipod doesn't accept USB input/output. This is for a computer. If you want something that is
mobile, look at the Fiio E7 or E17.
See the link above, navigate the website, and look at the models listed to understand why.
Very best,