What you were told does not appear to be the case.
"Canada's Office of Consumer Affairs"
"Always pay your bills on time. Although the payment of your utility bills,
such as phone, cable and electricity, is not recorded in your credit report,
some cell phone companies may report late payments to the credit-reporting
agencies, which could affect your score."
Although I could not find proof that Rogers Wireless is considered or
not considered an utility company by the Canadian credit bureaus, I
they will do as the above Consumer Affairs statement says they may do, and
report a late payment to the credit agencies.
The following example is to the extreme, but illustrates that point. If you
will scroll to point "44" on this page of the "Tea with Ted Rogers" website
you will see references to credit reports being made for alleged "overdue"
payments. It appears in this case that such reports were falsely made.
So, reports can be made, false or otherwise, by Rogers Wireless. In the case
noted above, they appear to factor into the credit score of a person as well,
as supported by the Consumer Affairs statement.
If you need clarification, please feel free to ask.
Google search on: "Rogers Communications" "credit report"
Google search on: Canada "credit score" utilities
Looking Forward, denco-ga - Google Answers Researcher