I agree we need to take care of those with dementia or Alzheimer's. Telus already subsidizes internet for low income families. Perhaps they can expand this program.
There is much more to consider than a just a discounted phone bill though. Those in that situation need someone to look after their best interests as a whole.
A responsibly family member could set up automated payments for the phone from the elder’s bank account, as they will need to do for all other payments there might be.
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I suggest power of attorney in this case. We had to do this for my grandmother, this is a family or caretakers responsibility. There is no way for any company to collect this information or act on a clients behalf.