TLでRealme UI 3.0でVolteが締め出されるという話が流れてきたものの端末によっては普通に使えるようです
メモ
adb reboot fastboot
fastboot reboot recovery # ドライバを当て忘れるとエラーが出る: "waiting for any device"
# adb shell setprop persist.data.iwlan.enable true
# adb shell setprop persist.dbg.ims_volte_enable 1
# adb shell setprop persist.dbg.volte_avail_ovr 1
# adb shell setprop persist.dbg.vt_avail_ovr 1
# adb shell setprop persist.dbg.wfc_avail_ovr 1
# adb shell setprop persist.radio.rat_on combine
# adb shell setprop persist.radio.data_ltd_sys_ind 1
# adb shell setprop persist.radio.data_con_rprt 1
# adb shell setprop persist.radio.calls.on.ims 1
# adb shell setprop persist.data.iwlan 1
# adb shell setprop persist.data.iwlan.ipsec.ap 1
# adb shell setprop persist.radio.volte.dan_support true
# adb shell setprop persist.radio.VT_ENABLE 1
# adb shell setprop persist.sys.cust.lte_config true
# adb shell setprop persist.rcs.supported 1
adb shell
sh << EOF
setprop persist.data.iwlan.enable true
setprop persist.dbg.ims_volte_enable 1
setprop persist.dbg.volte_avail_ovr 1
setprop persist.dbg.vt_avail_ovr 1
setprop persist.dbg.wfc_avail_ovr 1
setprop persist.radio.rat_on combine
setprop persist.radio.data_ltd_sys_ind 1
setprop persist.radio.data_con_rprt 1
setprop persist.radio.calls.on.ims 1
setprop persist.data.iwlan 1
setprop persist.data.iwlan.ipsec.ap 1
setprop persist.radio.volte.dan_support true
setprop persist.radio.VT_ENABLE 1
setprop persist.sys.cust.lte_config true
setprop persist.rcs.supported 1
EOF