Hi, with doing some research I cannot find a way to play these on the iPhone . Everything I turn up say they need to be converted.  So I don’t see an easy way. Especially accessible way other than converting them to something drop box or the iPhone can play. Now I think maybe just maybe if you sync these to your iPhone thru iTunes and in iTunes is a box to check to say convert files toAAC and this might work and make it easy to do as it will convert them to AAC files all at once when syncing. I think you find this box under the summary tab. This is all I can suggest at this point! HTH !