There is no need to explain the advantage of IP telephony to anyone. There are already programs for iphone that work with different ip operators, if you look, you can find it under skype. As I understand it, skype has not officially launched such a service yet, and it interferes with others. How it gets in the way, more on that later. So far, what has been discovered. Program i Skype. It weighs almost nothing and is a shortcut to the site. When you start the application, safari opens with the program's website. Come in, enter your username and password. This is how the bridge between iphone and scype is made. Everything is working.
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There is nothing special to say about the quality of communication, bad. But it's cheap. Now about the problems with the big brother. The other day I had to communicate for a long time and in detail with people in other cities. This is where this program was found. I transferred money to my account, made several calls. Things are good. And then a letter from Skype comes to the mailbox with a warning that someone may be using my account. In this regard, they return me all the money, whatever happens next. There are two conclusions. First, third-party development is discouraged. Second, if you need to call anywhere on earth for free, you can try my method.