Hi, I created next small LuCI app.
Luci-app-sms-tool is a mini gui for handling messages via sms_tool application/project https://eko.one.pl/?p=openwrt-sms_tool Works with mPCI-E and USB 3G/LTE modems. Don't work with HiLink/RNDIS modems. I'm making it available and maybe it'll come in handy.
Preview and quick configuration (modem Quectel EM12-G)
Other useful packages for mobile internet: