@localish GSM modems are getting rare because hotspots have become popular. I can’t find them in local shops anymore. Not sure brand is important but I’d want a model that is linux-supported & #wammu / #gammu compatible for versatility. In principle an openwrt or ddwrt router could look for wifi & use the GSM as a secondary option. It could VPN somewhere, or be a tor gateway.

Como instalar un #Servidor de Mensajería con #Gammu Parte 1 http://bit.ly/2HWHOq1 #tutorialesmanualestips #sms