I have a smartphone without the SIM card installed phone. When I leave home, I use exercise, clock/alarm, and flashlight apps. At home I use Google Voice on my

I have a smartphone without the SIM card installed phone. When I leave home, I use exercise, clock/alarm, and flashlight apps. At home I use Google Voice on my laptop for Voice/SMS service. The level of interruption is quite minimal, especially when I leave home.