For a start, most of the world does not use text messages. They use WhatsApp. (Apart from a few countries where WeChat, Telegram or Line are more popular.) As far as I know the US is the only country that still uses SMS/RCS.
So write a WhatsApp client for your phone and convince the EU to make them interoperate with you.
So write a WhatsApp client for your phone and convince the EU to make them interoperate with you.