Tidal Masters don't come through the iOS app yet. And I've not found a way to get MQA from my iPhone7 through Roon and iPeng to the Explorer2 for decoding. But you can enjoy great sounding hires over the network, or from locally stored files, to the DAC through a version of the camera connection kit with both USB and another lightning port for power. (Otherwise the iPhone will complain about an unsupported device, and switch back to the internal speaker.)

Even though Apple's own music app won't play hires files loaded onto an iPhone (5s or newer), third party apps such as the ONKYO HF Player give you that option.

Server: Audiolinux Roon NUC w/HAF room correction and crosstalk cancellation
Theater: 218, Allo Signature, miniDSP, HD621, C61R, DSP5200SEu, 420, 33, NHT subs
EtherREGEN w/Finisar fiber, Shunyata Denali
Living Room: RPi4 Diretta Host & Target, Ghent USB > Singxer SU-6 > AES NA M-Links > DSP9
Shunyata TritonV3, LHY lps, Farad Super3, Stack AUVA feet