iPhone 3G running iOS 4.2.1 and jailbroken... I know that WiFi stays on when plugged in or if cellular data is turned off. I want it to stay on all the time. I've heard that Insomnia doesn't work anymore. Turning off cellular data means I can't send or receive MMS messages. I'm using home control software and I want to be able to ping my phone every so often. If ping responds the system knows I'm home - if not, it goes into away mode. So to make this work, I need the WiFi always active.