Blackberry has become the latest smartphone to offer free wi-fi calls to users via its own software.
Research In Motion (RIM) has added the facility to its Blackberry Messenger (BBM) app, which already offered an alternative to text messages.
BBM Voice will only work if both caller and recipient are using the program.
It marks the firm's latest effort to keep users loyal to the platform ahead of the much-delayed release of the Blackberry 10 operating system.
The Blackberry 10 system is due to launch on 30 January, with the first devices running it available the following month.
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