Very few people according to a recent UK survey apparently. But, you should says AV company Sophos. Here are their top tips on staying safe when operating wirelessly outside your home or office:
Get out of the habit of remembering Wi-Fi networks. If your computer automatically joins networks based only on their names, you may end up connected to imposter networks you didn’t realise were there
Turn off Wi-Fi and Bluetooth when you’re not using them. You can also use "flight mode" although you won’t be able to receive calls in flight mode.
Consider using a Virtual Private Network VPN when you are on the road. This ‘tunnels’ all your traffic back to your home network, strongly encrypted, from wherever you are. It’s slightly less convenient but much safer, because it makes it harder for a rogue Wi-Fi access point to work out what you are up to.
Download an app with free VPN, such as the free Sophos UTM Home Edition.