According to RIM, it should run on 4.2
BlackBerry - Google Talk
Quote:
System Requirements
To use Google Talk for your BlackBerry® smartphone, the following is required:
A wireless data service plan from your wireless service provider
A Gmailxxx8482; User ID and password. You can obtain a Gmail UserID and password by being invited by a friend who has one or by entering your mobile phone number at https://www.google.com/accounts/SmsMailSignup1.
A wireless data service plan from your wireless service provider
Requires BlackBerry® Device Software v4.2 or higher (to find your software version, click Options on the smartphone Home screen, then click About)
If your device is connected to a BlackBerry® Enterprise Server, your IT Department must have IT Policy set to allow Google Talk functionality
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