article_snippet.sent: That means a customer could sign up for a plan offering three gigabytes of data and get $20 back if only one gigabyte was used in a month.
article_snippet.sent: Most wireless phone carriers allow Most wireless phone carriers customers to roll over unused data into another month of service without refunding any money.
article_snippet.sent: Those bundled plans allow several phone lines to share a pool of cellular data.
article_snippet.sent: Data is paid for in advance, and the cost of unused data gets refunded rather than rolled over or lost.