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Just as we saw with the iPad 3, it's highly likely if not inevitable that the iPhone 5 will come with next-generation 4G LTE mobile broadband, which puts 3G and HSPA+ speeds to shame. With tethering, it means mobile data users can hook up their iPhone 5 to their laptops and browse the web at blisteringly fast speeds.
But due to the incompatibilities between the 4G providers, it will mean Apple will have to provide two different iterations of the iPhone 5, just as it did with the iPad 3. Another problem for international customers is that Apple is suiting 4G for its mass U.S. audience rather than other countries around the world. In the UK, for example, the equivalent 4G band is reserved for free-to-air digital television, meaning UK and Europe will not have 4G working on their iPhone 5. Bad luck, as always.
Image source: Apple.