NET10 and Straight Talk and Walmart Websites.
The 16GB 5S is available in Space Gray, White and Gold for $650
The 16GB 5C in White, Pink, Yellow, Blue or Green is $550
As is their custom, NET10 and Straight Talk aren't telling us what network the new iPhones use. Fortunately it's not hard to figure out. Both brands use a market code to distinguish between networks. GSM4 is the market code for AT&T, GSM5 is T-Mobile, CO is Verizon and SPR is Sprint. You can see which phones are currently available in a given market using these URLS:
The iPhone 5C and 5S only appear on first URL for the GSM4 AT&T market which indicates that they are AT&T based phones. That's generally a good thing as AT&T is widely available and Straight Talk and NET phones have access to AT&T's 4G LTE high speed data. If AT&T coverage dosen't work for you, the Straight Talk and NET10 Websites offer the iPhone 4, 4S and 5 in Verizon markets
Should you buy an iPhone from Straight Talk or NET10? Probably not and here's why. Every AT&T based phone that Straight Talk and NET10 has ever sold has been SIM locked to only work with Straight Talk or NET10. If you have problems with the service you can't use the phones anywhere else. Both iPhones are available unlocked at store.apple.com and Apple stores across the country for the same price that Straight Talk and NET10 are charging. Unlocked iPhones will work with a Straight Talk or NET10 SIM, but they will also work with a SIM from any GSM carrier in the world giving you greater far flexibility. Unlocked iPhones also have a signifigantly higher resale value too.
Straight Talk and NET10 to Launch $549 iPhone 5C and $649 5S on Friday Dec. 13
Prepaid Operator Profile: Straight Talk
Prepaid Operator Profile: NET10