If you're travelling to Asia, one of the easiest to use and affordable SIM cards is the AIS SIM2FLY [https://www.ais.co.th/roaming/sim2fly/en/].  This will also probably replace my FreedomPop SIM Card [https://blog.ronsonchan.com/freedompop-global-sim-free-data/] since it doesn't really seem to work anymore nor