No LiFi does not work in your pocket, unless you have a transparent suit. 😀
LiFi is a complementary technology that works alongside other wireless technologies such as WiFi. If the light signal to a LiFi enabled device is below the receiver’s threshold then it will not receive data. In that instance, radio systems or cellular networks, if available, will continue to deliver data.
However, the moment the device begins to receive light from a LiFi light bulb, then the device will resume high speed communications using light as an additional communications medium.