Straight Talk, another MVNO, was actually her carrier. Her "refill" was via a pre-paid card she could purchase at Walmart. You can also do it online or over-t

Straight Talk, another MVNO, was actually her carrier. Her "refill" was via a pre-paid card she could purchase at Walmart. You can also do it online or over-the-phone with a credit card but she preferred to just walk into Walmart and buy a card with cash (she worked right by Walmart, anyways, and often shopped there so it was convenient for her).