Maybe they don't like having their precise location tracked 24/7?
That's a good reason for not carrying a phone, but getting a cheap SIM-connected device and leaving it at home next to their computer shouldn't reveal any more information than they already are by using their home internet and VOIP.
alt Hacker News
That's a good reason for not carrying a phone, but getting a cheap SIM-connected device and leaving it at home next to their computer shouldn't reveal any more information than they already are by using their home internet and VOIP.