Hi mate, I just got my A3 this week and just purchased one of these, it comes with an aux yes but still charges through the lightning, haven't tried playing music yet but I just use bluetooth for that. It does say its for the iPhone 6 but as said still works for charging and I'm guessing the aux would work for any phone?
Much better price too!
http://www.ebay.co.uk/itm/161705252317?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT