RIMs Blackberry Internet Service provides a possibility to connect your phone to the RIM Servers. The RIM Servers get the emails for you or retrieve the webpages your phone requests. Thats not the same as a 3G/4G Subscription. For your reference:
http://crackberry.com/blackberry-101-lecture-2-bes-and-bis-whats-difference
Cheers,
RBA
Very true. There's a form of compression done by the RIM servers so that the requested data you received isn't of the same size as the original. Don't really know how to explain this. This explains why a 3gig BB subscription is far 3 times cheaper than a normal 3gigabytes data subscription.
To use a BB plan on your android device or PC, all you need is find out the APN you carrier uses. Some still use the common blackberry.net APN. Most have changed theirs though having realised that customers use these plans on their PCs.
You seem like one writing from Nigeria.