I have this fido SIM card which tells me to go to fido.ca/simcard to activate it. The page doesn't exist anymore.
There is also the online instructions
Which I tried to follow but cannot find the button it tells me to press "Update SIM Card."
Hi I'm not sure what you mean by "new line" or "existing line" but currently I am using one SIM card but it does not fit in my new phone. I have this card which has a nano sim card and says I can register it at fido.ca/activate which no longer exists which does fit in my new phone