I think it would be extremely helpful for customers to be able to get notifications about their airtime usage via text message. For example, a text message could be sent when the available airtime was 50% used, and another when the limit was almost up. I understand similar notifications are available for data usage, so it should be simple to put in place
This measure would be particularly beneficial to persons such as myself who suddenly find their calling patterns have changed for whatever the circumstances may be. I myself recently incurred $224 in additional airtime during the two months that transpired after my husband's cancer diagnosis, when life became as a blur of doctor appts, waiting forever on hold to get in, tests, surgery, people calling to see how he was, etc. When your husband's life is on the line, worrying about phone minutes is likely the last thing on your mind, especially if you've never used up your minutes before. As I was at the hospital without access to a computer, I didn't print my bills out till much later, and what a shock! If someone had let me know I was going way over my limit, I would gladly have signed up for the $20 / month add-on for unlimited minutes, or looked into other available plans and upgraded.
I think this idea would give customers some reassurance that their next bill isn't going to be a shocker. I had been a loyal Koodo customer for some time, signing up family members and telling others how great Koodo is, but there's nothing like getting a nasty bill to leave a sour taste in your mouth. Text notifications would ensure customers like me keep having positive experiences even when difficult life circumstances.