http://www.engadget.com/2012/09/13/a...-data-on-cdma/
It's "not yet possible" to do side-by-side CDMA voice and LTE data on a "single-radio" design like the iPhone 5, she says. That's technically true, although it may be a case of Apple wanting to keep hardware differences to a minimum between CDMA and GSM users. AnandTech founder Anand Lal Shimpi tells the New York Times that Verizon phones like the Galaxy S III, which don't have this limit, follow a different approach: where Apple uses a second antenna to improve overall reception for a single connection, Samsung and other phone makers use theirs to keep both data and voice flowing in harmony.

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