I run a Southeast Asia Xperia 1 VI (XQ-EC72) on T-Mobile in the US. Sony never sold a US model, so the SEA firmware ships a modem band policy that leaves most US 5G NR off. The old workaround was the DSDS toggle in *#*#4636#*#*. I wasn't able to get that to work, so I ended up trying a different a...