This Espressif ESP32-Powered 4G "Smartphone," Programmed in the Arduino IDE, Packs The Essentials

https://lemmy.eco.br/post/21383903

Nice. The 4g module is $17.90 from digikey, much less than last time I looked. I wonder if there’s a 5g version. I also wonder if there’s any issue using retail sim cards and making LTE voice calls.
the reddit discussion is interesting
Any particular reason?