That is correct. Also Rogers & Bell & Telus never got it as its not worth for them to sell it outright for 325+ tax. Remember the carriers want to make money, so Google & the carriers most likely did not agree to it.
I've used an Android phone (Sony X10, Captivate Glide and now Nexus 4) for the past 3+ years using my old customer retention plan which only includes 500Mb of data and I've never gone over.
However, to conserve data (and battery) I turn off all auto-updates. Such as Facebook/Twitter to only update when I run the app.
Avoid streaming of audio/video on low data plans as they are the biggest data hoggers
You can also conserve GPS data by saving the map to your phone. In Google maps, go to the area/city that your interested in, and press menu and select "Save to Offline" and you can save the map directly onto the device and thus not using any data when you only need the GPS signal since you already have the map on your phone. [Kudo's to Goooooooogle for doing this]