Unwanted text messages can interrupt your business, compromise your privacy, and even lead to additional text message charges if your mobile service provider charges you for the message you receive. If your company uses Google Voice, use the Edit Settings screen to block text messages from an existing contact or unidentified number. The Edit Settings screen is accessible from the Google Voice web interface.
In addition to standard voice calls, you can use iPhone to make video calls with another iOS device or Mac using FaceTime. Depending on the version of your iPhone, the requirements for using FaceTime vary. For iPhone 3GS and iPhone 4, you must have a Wi-Fi connection to use FaceTime. However, for iPhone 4S and higher, you can use a mobile data connection in addition to Wi-Fi. There are three ways to activate FaceTime when using iPhone.