Alternatively, instead of using your cellphone to make a call, use a computer -- preferably a public one, like those at most libraries. That way, your home computer's IP address won't be identified with the call. Or, if you use a device at home, go through an anonymizing service. TORFone is an Internet calling-app that routes your call through six anonymizing servers and encrypts your conversations, hiding both whom you're talking with and what you're saying.
No method is fail-safe. And in some countries outside the United States, encryption apps are illegal. If you're traveling, check with the U.S. State Department on communication rules specific to your destination.
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