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If you like a "little" more technical explanation read the link below:

http://www.anandtech.com/show/6295/why-the-iphone-5-lacks-simultaneous-voice-and-lte-or-evdo-svlte-svdo-support-

Now I know why the Galaxy S3 is so big and so heavy.

Apple made a really good job... the design created is just possible because the lack of "Talk and Data" simultaneous... I want and need an iPhone 5.