I have an international plan on AT&T. I'm in Western Australia connected to the Telstra network. Have full signal, can make calls, send texts, but my data doesn't work. I can't access my e-mail or the internet. My mobile network setting under "quick settings" goes between saying ON and Turning On. I have allow data while roaming option checked as well as the enable always on on mobile data. Any help would be greatly appreciated! Thanks!!