AT&T is making it easier to make phone calls. 

The company is now making Wi-Fi calling available to all customers with an iPhone 6 or newer model. 

The phones will automatically switch to a Wi-Fi connection for calls and texts if cell signals are low or unavailable. 

The feature was turned on Thursday. 

Wi-Fi calls are free as long as they are between US, Puerto Rico or US Virgin Island numbers. 

No apps are required, but phones must be running iOS 9. 

T-Mobile and Sprint have had the feature for a couple of years and they allow many more phones to use it. 

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