The WiFi OBD2 devices that Carista uses create a WiFi hotspot that you need to connect to manually. Before you start using Carista for iOS, open your iPhone or iPad’s settings, go to WiFi and connect to your OBD2 WiFi device as you would connect to any other WiFi hotspot. Wait for the connection to be fully established (for the WiFi icon to show up in the top bar) and then open Carista and start using it. If you get to a point where you’re making an in-app purchase, you must temporarily disconnect from the OBD2 WiFi network in order to regain Internet connectivity. When you’re done with the purchase, reconnect to the OBD2 WiFi network. The same process applies when submitting a problem report, as that functionality needs an Internet connection as well.