This makes no sense for many folks
This plan really doesn't make sense for many people. After all, if you're eligible for an upgrade on an existing line, and you already have a smartphone, then you would have gotten your last upgrade nearly two years ago, so you already have unlimited data, which you ought to be able to keep after an upgrade.
This deal only makes sense for:
1. New customers
2. Existing customers adding a new line
3. Existing customers upgrading from a dumbphone