Dan Hesse, CEO of Sprint, really loves having the iPhone on Sprint. Elizabeth Woyke, writes for Forbes:
The iPhone is so data-efficient, [Hesse] said, it will help Sprint keep its mobile data plans unlimited.
Good news for Sprint customers. AT&T users are still healing from the gouge wound back when AT&T was all, we can’t handle all the iPhone data, and so they held back features (tethering) and started charging more for others (data plans).