Good luck with that too, with carriers sunsetting legacy networks, old dedicated dumbphones will no longer work in most cases. KaiOS is sometimes used on dumbphones, but most these days just run a fork of Android designed for dumbphones.
Maybe Meshtastic with an SMS API gateway is the way to go. Or cans and string.
There’s still a surprising amount of devices made by HMD (who own Nokia’s consumer phone brand, so you’ll sometimes see them as Nokias) that run Series 30+ (think old Nokia software with some very slight modern enhancements) but have 4G hardware to play ball on modern networks.
Good luck with that too, with carriers sunsetting legacy networks, old dedicated dumbphones will no longer work in most cases. KaiOS is sometimes used on dumbphones, but most these days just run a fork of Android designed for dumbphones.
Maybe Meshtastic with an SMS API gateway is the way to go. Or cans and string.
There’s still a surprising amount of devices made by HMD (who own Nokia’s consumer phone brand, so you’ll sometimes see them as Nokias) that run Series 30+ (think old Nokia software with some very slight modern enhancements) but have 4G hardware to play ball on modern networks.