If you are using an LG Bluetooth headset, press the volume down button on your Bluetooth headset when there is an incoming call.
This will read out the caller information to you.
There are some Bluetooth headset modules that will read out caller info to you even if the volume button is not pressed.
In addition, if you are using an LG Bluetooth headset, install and use the 'Tone & Talk' app to access a wider variety of features.
The volume down button is operated differently depending on the model of Bluetooth headset. For example, on the HBS-900 model, the volume controls are in the form of a switch that moves up and down. In this case, you can move the switch down.