> If I were going to China on business I'd have a separate cell phone just for that purpose. You can just swap sim cards if you need to keep the same number. Sm

> If I were going to China on business I'd have a separate cell phone just for that purpose. You can just swap sim cards if you need to keep the same number. Smartphones are so cheap nowadays you might as well have a burner for that purpose. A SIM card is an independent computer that runs a stripped-down version of Java. According to this comment (https://news.ycombinator.com/item?id=17083221 https://news.ycombinator.com/item?id=17083221), the cell network can even upload programs to it to run.