Sprint Nextel CEO Dan Hesse told analysts Wednesday that its 4G WiMAX service would be "enormously important" to the carrier this year, telling them the carrier has much at stake as it attempts to stem a declining customer base. Hesse also said Sprint's growing prepaid service would seek to avoid eating into its core business by marketing the product through different brands and distributors. Sprint also said it would begin mobile digital-TV trials in the Washington, D.C., and Baltimore areas with Samsung this quarter.

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