Is there a way, either via Blackberry Intenet Service or on the phone itself, to track how many minutes (or how many MB of data) one has used up in the current billing cycle...or used this month...or used to date??

You should be able to log into your account online and see all the data there... I know I can on T-Mo at least....

Verizon, Cingular and some other providers has a number code that you can call to get information on how much minuets you have used in you plan and how much you have in your plan. I tried to find something online but came up with nothing. Call customer care and see if Rogers supplies something like that.