A 16GB iPhone 5 will sell for $99 up front with 24 months of $20 payments — that’s $579 over the two years, $70 less than buying an unlocked iPhone 5 from Apple.
There you go. It’s not just about being the uncarrier, it’s about being another carrier with the iPhone and maybe reasonable prices. Still, it’s not revolutionary — it’s not a contract, but man, it smells like a contract.
Pro tip: buy a Nexus 4, outright, and be happy.