No you can't. The main reason is that there is no such thing as a "Blackberry Rio".
The Rio is a inexpensive phone by Orange that just happens to look like a Blackberry.
Although it looks similar, it lacks most of the features and is not compatible with Blackberry's software or applications.
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BBM The acronym for Blackberry messenger is BBM. Blackberry's basic acronym is BB, although it is not used as commonly anymore now that Blackberry is on the decline.
One can get MSN Messenger for Blackberry by going to the blackberry app world website on the phone or application, searching for the MSN Messenger application and download for free.
"Blackberry has many applications, with numerous ones that are free. Some free blackberry applications include Facebook, Blackberry Messenger, AccuWeather for BlackBerry, Player for YouTube, Windows Live Messenger, iSpeech Translator, Twitter, etc."
no. blackberry messenger is not free on o2. you must change your tariff to a blackberry bolt on tariff to use blackberry messenger. i currently have a bolt on which costs £5 a month for 500mb of internet and blackberry messanger and blackberry app world.
Simply go to the messenger settings