Ok. Well, I ordered Avani with Smoke Monk Plus with Mic. I am using PowerAmp but not sure if it will make any difference and especially how convenient it will be and will not destroy my Earphone Plug and USB Port of the Phone so that needs to be seen.That is not correct. When I receive a call on my LG G8 with XTremPro dongle attached, the music mutes, I hear a ring tone and I am able to answer the call.
You seem to have a lot of opinions, not much experience. If you truly are interested in listening on a mobile phone, I highly suggest you purchase a dongle DAC, because your Samsung phone sounds pretty poor on its own.
Another advantage of the LG Quad DAC that hasn't been mentioned. I can listen to high quality sound while my phone is charging, because the USB port is not taken up by a dongle.
Listening right now to my G8 through Grado GH4 headphones. The sound is really quite impressive, far beyond my Sennheiser and Beyerdynamic IEM's, and it will play loud enough to damage your hearing. With the 250 ohm DT 1990 Pro, I have to run around 3/4 volume, but it will still go uncomfortably loud. Of course either of these headphones do sound better with better gear upstream, especially the DT 1990.
I use PowerAmp and did no like HiBy or Neutron App much as they are very flat sounding, not airy and no bass at all. While PowerAmp sounds Amazing already but as you all suggested and mentioned, that using DAC will take it to some other level of sound quality, so I am hoping that the sound quality will improve by at least 10X times with lots of lots of minute details and nice bass and some sub-bass feel too. Let's see.
Also, it will still not allow me to charge the phone if I use the DAC to listen to the music. I found cpl of Dongles which allow you to charge at the same time. One of them is: https://www.aliexpress.com/item/4001260105218.html
How does it look? Anyone used this? Is that good to give the same 10X sound quality?
Also, what app you use to listen to the music? Anything better than PowerAmp?