If your wireless service provider supports UMA (also known as GAN) and you subscribe to this service, you might be able to make calls, visit web pages, and send and receive email messages, PIN messages, and text messages with a Wi-Fi® network. Your BlackBerry® device automatically switches between using your mobile network and Wi-Fi networks, depending on what is available in the area where you are using your device. For more information about UMA, contact your wireless service provider.