Many of the newer Android phones don’t even need an OTG cable -- a simple USB to USB cable works fine. At least it does with my LG V20, now about 3 years old.
I've had good results using the app "USB Audio Player Pro," which I had to pay a few bucks for. This makes sure the full resolution on your phone gets to the DAC. (However, if you were considering Bluetooth, high-res may not matter to you.)
I've had good results using the app "USB Audio Player Pro," which I had to pay a few bucks for. This makes sure the full resolution on your phone gets to the DAC. (However, if you were considering Bluetooth, high-res may not matter to you.)