Since going on 3G, I have become very concerned about bandwidth usage. I use my BB with BIS only to browse the web and check emails - apparently you don't incur any data charges if you use only the BIS & not the carrier services. So far so good.
I am amazed at how little BF3 uses in terms of bandwidth. Running Mumble alongside BF3 rockets my bandwidth consumption so I'll probably only be doing that on Thursdays until I can find a more permanent solution to my connectivity woes.
I thought you guys might be interested in what BF3 consumed for almost 5.5 hours of BF3, last night, so see attached. Seriously impressive, +/- 200MB for 5.5 hours.