No, many of them have no such capability.
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USB OTG (On The Go) is the magic phrase here - but from my understanding, USB OTG support isn't always the same. Seems Samsung is pretty good at this. HTC One and Xperia Z also seem to support standard USB digital audio out (the only other two I have checked out)
A few weeks ago I reported that the GS4 works with the E17, just simply plug and play with no USB audio recorder pro app required. I had tested it on wifi, and 3G, and reported that 3G was dead silent, and that wifi made some light interference with the E17. Well tonight I was sitting at home bored and decided to drive a few miles down the road where there is a 4g signal, I can finally report that the E17 is dead silent with Verizon 4G LTE on the GS4. I was a bit worried that there would be some interference from the 4G signal, but I did not hear any noise at all.
I normally used a ipod 7th gen 160 for music listening. However recently I have gotten the S4 (9505) and I am very much impressed with the sound of it. I didn't directly compare the ipod and s4, but I generally feel that the sound of the S4 is smoother and with much better (lower) bass. I use sennheiser hd 25 headphones.
Nope, it is plug and play with the stock software and will just simply work with any music player. Just use an OTG cable, crank up the volume and go.
An OTG cable from the GS4 to the E17 will feed the E17 with a digital audio signal. So you will be using the E17 as a DAC and amp. Basically this means it'll sound as good as using the E17 as a DAC with a laptop.
Put the phone volume on max, use the volume on the E17. I would use the E17's EQ if it is enough for you. Some of the Android apps EQ's will have more control, meaning finer adjustments with more bands, but I'd use the E17's EQ only if you can. That way the signal coming from the S4 will be the cleanest possible signal.