Samsung's (SSNLF) battle with Amazon's (AMZN) Alexa and Apple's (APPL) Siri is heating up. 

Samsung has now expanded its digital personal assistant Bixby to over 200 countries worldwide, including Australia, Canada and the U.K. with the service available on the Galaxy S8 and S8+.

The expansion of the digital assistant shows Samsung is stepping up its challenge to Alexa and Siri.

Injong Rhee, Samsung's Executive Vice President, said "The expansion of Bixby's voice capabilities is an initial step in the continued rollout of Bixby functionality."

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