08-03-2012 11:53 AM
Hi and Welcome to the Community!
To use the proprietary BB services (including Push email capability, BBM, etc.), you must have an adequate data plan from your carrier. The carriers host BIS (BlackBerry Internet Service) for their BB users. Typically, BIS is not available via generic data plans. Many carriers call what is necessary The Blackberry Data Plan. Whatever they call it, it is the carrier who delivers BIS to their BB users -- contact them for assistance. Once you have a BIS-capable data plan on your BB (at whatever fees your carrier will charge, btw), your BB-proprietary services will function (e.g., you will have Personal/Internet Email added to the email setup wizard, your BBM will function, etc).
With hundreds of carriers in the world, each with dozens of different data plans, it's impossible to tell you specifically what any service plan might actually provide. Only the carriers can answer that question. The best thing to do is to decide what services you desire, and then talk to your carrier about obtaining (from them) a data plan that enables what you desire.
08-13-2012 03:47 PM
When you use Google Talk (or any other chat apps), messages are pushed to your phone. In order to have these messages pushed, you need BlackBerry Internet Service (or BIS for short) enabled on your account. You can still use a BlackBerry phone without BIS but nothing will get pushed to it, you'd have to go to the sites from which you wish to get updates (facebook, twitter, chat sites, email account, etc.). This applies no matter how you connect with your phone, either by Wi-Fi or network connection.
I hope that clears things up for you.