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Somewhere out there, Apple is testing an iPhone with 4G LTE capabilities, according to the mobile site Boy Genius Report.

An internal iOS test build from a US carrier reveals that Apple has a settings file for LTE technology floating around. This isn’t too surprising, since I can’t imagine that Apple is sitting on its hands as LTE 4G networks pop up around the world.

But I wouldn’t hold my breath for LTE 4G to be included in the iPhone 5, which is expected to be revealed next month. Since this is the first evidence we’ve seen of Apple testing LTE, it’s very likely the company still isn’t ready to implement the technology in devices. And judging from recent LTE 4G phones, battery life is still a major issue with LTE chipsets.

Basically, all of the points I made back in May about why the iPhone 5 won’t have LTE still hold true. Until battery life isn’t a concern, we likely won’t see an iPhone with LTE.

Apple could still include support for faster HSPA+ networks in the iPhone 5, although that would only work on GSM carriers like AT&T and T-Mobile. AT&T is currently referring to its HSPA+ network as 4G, with devices like the Motorola Atrix 4G. I can’t really see that happening though, since it will leave CDMA carriers like Verizon out in the cold with slower 3G speeds on the iPhone 5.

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