How low can you go? That's the question Virgin Mobile is posing across the wireless industry today as the Sprint-owned company rolls out what are probably the best deals you're going to find on no-contract iPhones (iPhone 5s and iPhone 5c).

For the time being, Virgin Mobile is selling the 16GB iPhone 5s, for example, for just $385. A 32GB model will run you $455. The 64GB variety is $525.

The iPhone 5c is also discounted, the carrier confirms, starting with the 16GB model ($315). The 32GB iPhone 5c goes for $385.

So,

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