If you are accessing an insecure WiFi in a public place, you may be allowing unauthorised people to intercept what you are doing online. Your passwords, emails and personal information could be at risk.
This can happen if the WiFi connection is not encrypted or if someone has set up a fake hotspot which persuades you to believe it is the legitimate one.
You can tell that you are on a secure connection if the WiFi asks you to add in a ‘key’. Even by logging onto a internet access page within a hotel or cafe does not guarantee that the connection is encrypted.
Unless you are using a secure WiFi you should not send or receive private information when using public WiFi. Where possible, try to use commercial hotspots such as BT OpenZone or T-Mobile.