I get a kick out of products like The Light Phone. Our smart devices have made life so complicated that something like a phone with a reduced feature set becomes a novel idea.
The Light Phone is a discreet credit card sized mobile phone designed to be used as little as possible. It is the only phone designed to be used as your second phone as a seamless extension of your smartphone. It is an unlocked 2G GSM phone that works independent of your current plan, but using our unique software platform it can keep your same phone number. The Light Phone is easily set up and controlled via an app on your computer. Other features are limited to nine speed dials and a time display.
Source: The Light Phone