O2's public WiFi hotspots can be useful in a pinch, but filling out the obligatory registration forms to gain access has always been a pain. To speed up the process, the network is introducing a new service called O2 WiFi Extra, which automatically connects customers with an O2 SIM card. That means no SMS verification codes, or even looking through your network settings for the correct WiFi hotspot. The catch? Once the feature has been enabled, you'll be connected to them automatically if "the WiFi signal is stronger than O2's 3G or 4G network." It's not clear exactly how the company defines signal strength, and if you don't like the service, O2's only advice seems to be disabling WiFi entirely.