The struggling Canadian smartphone maker had announced plans to open up the service, often referred to as BBM by both fans and the company, back in May.

Once a unique tool to send short messages without running up SMS charges, BBM now competes with mobile instant messaging products from Facebook, Apple and others, and less directly with the micro-blogging service Twitter.

Android users will be able to download the application on Saturday, while iPhone users can get it on Sunday.

(Agencies)

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