It reduces the risk surface. If the device with a sim card doesn’t have a microphone, camera, or gps, then if it gets exploited you have a higher barrier to losing all your privacy.
Hopping from wifi to wifi, and turning on a cellular modem on demand can work. When I was in Japan I met a girl who didn’t have a sim card at all, not for privacy reasons, her life had enough wifi that it wasn’t a issue.
It reduces the risk surface. If the device with a sim card doesn’t have a microphone, camera, or gps, then if it gets exploited you have a higher barrier to losing all your privacy.
Hopping from wifi to wifi, and turning on a cellular modem on demand can work. When I was in Japan I met a girl who didn’t have a sim card at all, not for privacy reasons, her life had enough wifi that it wasn’t a issue.