(If you can’t disable 2G and 3G and they are still used by your carrier, you can switch to LTE only or NR/LTE or NR only in *#*#4636#*#* menu. This menu may be disabled on some devices.)
This also helps with reconnecting faster when travelling as it won’t have to unnecessarily search for 2G/3G towers.
Alternatively, you could forward all calls somewhere else, so you can still make calls yourself right away.
It does. I’ve been using it, I tested it, it works. They just get the info that I am “currently unavailable” and I get SMS with info on who tried to call me when I was “unavailable”. Just like airplane mode, but I get to keep data and SMS.
2G will be used only for emergency calls.
4G/5G doesn’t support traditional voice calls like 2G/3G did. Only VoLTE, VoWiFi and VoNR which are a total mess with lack of one universal standard. (And you can disable them, which is the point of my comment.)
Problem solved.

You can’t call me.
(If you can’t disable 2G and 3G and they are still used by your carrier, you can switch to LTE only or NR/LTE or NR only in
*#*#4636#*#*
menu. This menu may be disabled on some devices.)This also helps with reconnecting faster when travelling as it won’t have to unnecessarily search for 2G/3G towers.
Alternatively, you could forward all calls somewhere else, so you can still make calls yourself right away.
This uh… doesn’t disable people calling you, just from 4G using LTE data to establish the call.
It does. I’ve been using it, I tested it, it works. They just get the info that I am “currently unavailable” and I get SMS with info on who tried to call me when I was “unavailable”. Just like airplane mode, but I get to keep data and SMS.
2G will be used only for emergency calls.
4G/5G doesn’t support traditional voice calls like 2G/3G did. Only VoLTE, VoWiFi and VoNR which are a total mess with lack of one universal standard. (And you can disable them, which is the point of my comment.)
But they can try, if that’s what you meant.