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Phone on the App Store
Phone by Google - Apps on Google Play
Make & receive phone calls - Phone app Help - Google Help
How to Make Phone Calls over the Internet: 11 Best Apps - wikiHow
How to Make a Phone Call: 6 Methods to Place a Call - wikiHow
Make a call with Google Voice - Computer - Google Voice Help
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Telephone call - Wikipedia
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How Telephones Work | HowStuffWorks