AT&T subscribers might not have to worry that their Sprint, T-Mobile and US Cellularfriends will tease them while they're waiting for their Galaxy S 4 to arrive. While Big Blue was originally promising an April 30th date for the headlining Android phone, the carrier has quietly moved up its shipping estimate to April 23rd, right on time for the initial wave of US releases. Yes, that's only a week's difference -- but first-kid-on-the-block bragging rights surely matter, don't they?

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