The iPhone 5S may look the same on the outside (at least according to alleged leaked photos of the handset), but under the hood Apple’s new handset may feature ultra-fast LTE-A technology. According to The Korea Times, Cupertino is working with SK Telecom to implement the new service. However, the Korean paper’s sources don’t have the best track record, so don’t take this latest report as fact just yet.

Samsung recently announced the Galaxy S4 LTE-A, an upgraded version of its flagship handset, and now Apple may fire back with an LTE-A handset of its own. An anonymous SK Telecom executive claims that the company approached Apple about working together, adding, “We are in the middle of negotiations.” If this rumor turns out to be true, the new technology would offer twice the data speeds of the current iPhone 5.

“There’s no reason for Apple not to use the LTE-A technology,” the source said.

Besides, The Korea Times’ spotty record, claims that Apple is in negotiations with SK Telecom don’t add up with leaked photos that suggest the iPhone 5S has already reached the manufacturing process. Implementing LTE-A would likely mean halting production, though Apple has been known to make last minute changes in the past.