YMOO DS400+. A very basic one. The 660S2s were a gift so they just wanted to get me going. Sounds perfectly good to me though. Will upgrade down the line but totally good for my uses.

As for the phone, there’s probably a way to do it but not 100% sure sorry.

I have these and use them for 90% gaming and 10% music (Apple Music lossless) and can definitely attest that they sound incredible.