T-Mobile USA's disclosure on Tuesday that it will introduce Samsung Electronics' new Galaxy S4 on May 1 offered the first indication on when the smartphone will come to the U.S. The telecom did not disclose any pricing details for Samsung's flagship device. Samsung's Galaxy S III phones will not be compatible with T-Mobile's new Long-Term Evolution network that began rolling out Tuesday in seven markets. The phone lacks a compatible LTE radio, a T-Mobile executive said.

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