ARC and cell phone service (G4) - some challenges

I live in an area with “OK” cellular service - nothing great, and certainly not 5G. I’m running an iPhone 12, and it works fantastic with ARC over WiFi.

II took a 10 mile car ride after work to check out ARC from afar, but my music selections kept buffering. Easy and fast to pick an album, but couldn’t get it to play. I was getting 3 bars and a 4G service.

I have the setting set to “bandwidth saver” for cellular.

I’m able to stream music on services like TuneIn, and native Tidal.

Does ARC require 5G? Any words of wisdom? Thanks!