使用运行SKYPE或类似软件的智能手机不单可以免费打电话，还不用受运营商的条条款款限制。

A smart phone running Skype or something similar would be essentially free of usage charges and unfettered by all the restrictions that carriers impose.

youdao

感谢您已经注册成功，现在就可以免费打电话了，我们将会给您发送了一封邮件，会告诉您如何使用我们的服务。

You've successfully registered yourself and can now start making free calls. We have sent you an email with information on how to enjoy this offer.

youdao

上面的文字大意就是简单的填写下面的表格，你将很快收到一条短信验证码，然后你就可以免费打电话给这个世界上的任何一个人！

Simply fill out the information below and submit, you will instantly receive a text message with a PIN number and local access number to call anyone in the world for free.

youdao