There is no caller ID block for 800 (toll free numbers).Originally Posted by oyeeeee
I've authenticated/activated my credit card using my Fido phone when I had a Fido voice plan and it was my "home phone". The automated credit card system for my bank was able to determine that I was calling from the number identified as being my "home number" (which was my Fido number). When I called from my Fido number, it asked me for the credit card number and I think that it asked me for some personal information like to key in my year of birth. The system then replied with something like "Since you are calling from your home phone number, your credit card is now activated".
Another thing is that you can't block your number from being displayed when you call a toll free number if the person subscribes to call display. Since the company is paying to receive your call, they also receive your phone number if you decide/attempt to block it.
The only thing that I can say is "Call Display" is not perfect. There have been times when I've called myself from an unblocked number and the phone number displayed on my phone would be similar to if I didn't subscribe to call display.