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Skype requires the use of a client program that is not free software; in other words, the users don't control it — it controls them.
You should never run a nonfree program, so this is enough reason to refuse to use Skype. But there are other bad things about Skype.
What to use instead? The most obvious alternative is a long-distance phone card. They are quite cheap nowadays, and they work with any phone.
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