Back in the day the dumb phones had an interesting function - you could use them for synchronous real time voice communication over public switching network. Un

Back in the day the dumb phones had an interesting function - you could use them for synchronous real time voice communication over public switching network. Unless apple removed it with the headphone jack - it is probably still somewhere in the device. We also have an Avogadro constant types and brands of chat apps. If you use email for time sensitive communication - it is your fault.