The iPhone 5 will have 4G LTE, but not all carriers around the world will be supported.
It is a mystery to me how a new technology like 4G LTE is more fragmented around the globe than 3G was. Why do humans always make the same mistakes. According to a new report on the Wall Street Journal, that confirms that Apple will put 4G LTE in the iPhone 5, IDC says that there are 36 LTE bands compared to 22 3G bands world-wide.
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The iPhone 5 is though supposed to be more global than the iPad 3 4G LTE is. The iPad 3 4G LTE is a failure in Europe and triggered a marketing mess as it does not support the European 4G networks. The iPhone 5 is though supposed to work also on 4G LTE networks in Europe.
I think it will be even take a while after the iPhone 5 announcement on September 12 to find out if the iPhone 5 will support 4G LTE in your country.