Signal doesn't support Android tablets, WhatsApp doesn't allow multiple devices (don't mention web, didn't work on tablets either). Hangouts used to just work,

Signal doesn't support Android tablets, WhatsApp doesn't allow multiple devices (don't mention web, didn't work on tablets either). Hangouts used to just work, especially for non-technical users, now it's a complete mess, as on some old devices it can't even be uninstalled.