Prepaid Plan Auto Top-ups: "Every 30 Days or When Balance Falls Below $5.00" Choice Implications

If I recall, it is a legacy from when there was a per minute fee for minutes, and it would top up if your consumption caused your balance for payment of minutes dropped. I doubt you’ll have success using it in the manner you describe, but you could experiment, and share your results!

I just dropped a $25 coupon every so often, as the excess was carried over.