Silent Circle, the company known for the development of mobile pricvacy apps, is offering a secrecy-cloaking phone service that lets customers make and receive private phone calls. Silent Circle offers its customers a secure means of encrypted communications that disposes of all records of calls, texts or emails.

The Out-Circle Calling plan works on Apple iOS and Android smartphones and, eventually, on Windows Mobile systems, the Geneva-based firm said. Callers can reach 79 countries, including China, Russia, most of Europe and the Americas. Large parts of the Middle East and Africa are not covered.

The new calling plan starts at $12.95 a month for 100 minutes of outbound calls and runs up to $39.95 for 1,000 minutes of calling.