So when Apple updated the iOS software that runs the device and turned the screen lock switch into a mute switch last year a lot of people complained.

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Last week when Facebook updated its Facebook Messenger app for the iPhone it included free voice calling in the U.S. A users can place a call to contacts from the conversation list if that person has Messenger for iOS meaning both parties need to be using the Messenger app.

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Customers are encouraged to check back often, as the maps will be updated when coverage in these markets is enhanced.

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