First off, while theoretically, you should be able to use your smartphone data plan to make free calls to all kinds of places, there is no single app that lets you use your cell phone to make free calls everywhere. What you can do is use your computer and a service like Skype or Google Voice to call any number or computer on earth. Or, you can use your smartphone, equipped with something like a Skype app to call other smart phones with the same app over the Internet for free but you can't use them to call phone numbers for free. Even so, the more you try calling over the Internet, from a computer or smartphone, the more you will come to realize that Internet calling isn't really all that it is cracked up to be. To begin with, Internet calling means making do with crackly, distant and choppy voice quality. It also means waiting longer to connect and putting up with a certain number of dropped calls. And then of course, there's the matter of voice delay. If you are expecting voice transmission that's as instantaneous as a normal phone call, you'll need to take some time to readjust. Your voice takes longer to reach the other end and you'll find frequently that you and the other person keep talking over each other.
If you happen to be on Wi-Fi (and not your 3G Internet) though, calls from your smartphone or computer to anywhere can be pretty clear. If you call any phone number in America it's $3 a call, no matter how long the call is. And then, depending on what application you're using, you can have different kinds of benefits. FreePhone2Phone is great in that it's not an app thing. You just get to call landlines in almost any country just as long as you agree to listen to an advertisement. Google Voice is free, but it uses up your cell phone minutes to make calls. Additionally, unless you are using a complicated app called Talkatone you can't use it on a smartphone. And the Line2 app on your smartphone functions like it was a separate number working on your phone. It becomes active when you have Wi-Fi. You pay $10 a month and you can call regular phone numbers as much as you want.
And of course, all of these apps will only work for specific countries. Internet calling is still a system that tries to work around a number of obstacles placed by the service providers and the laws. Things should clear up quickly though.
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