Use FaceTime and Not Cellular Minutes
One of the hidden treasures in the iPhone’s FaceTime feature is that it only works over Wi-Fi. This means that since you and the person you’re talking to each have an iPhone 4 or 4S (or another compatible iOS device) and are on a Wi-Fi network, you can make unlimited FaceTime calls without ever using any cellular minutes. This is great for international travel or any other situation where roaming would be expensive.
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