[tsac]

I looked at various services including Rogers and it seems none block calls as is done on home phone service. I would suspect because the calls are being sent from various radio locations vs. a single central office as is the case for home phones, it is impossible to effectively block calls so they simply do not offer the service on cells.
The Apps offered also are limited and cannot block calls before they are received by the cell phone so the App simply forwards the incoming call to your voice mail.
Not good but the best available now.