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From my understanding it's not that current quad-core chips are incompatible with LTE; it's that they don't have LTE capability in the SoC, so it needs to be implemented by adding an extra chip on the device. The integrated LTE on the SoC, as the S4 does it is the preferred alternative as it keeps devices thinner and uses less battery life. Adding more chips puts a bigger toll on the battery.
Basically, if a carrier wants that quad-core chip and LTE, all they have to do is request it and deal with shorter battery life and a possibly slightly bigger device because of the extra circuitry.
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