Digital Trends - OccurringÂ*on early Friday, a handful of T-Mobile customers were treated to a test of theÂ*Personal Localized Alert Network (PLAN) thatÂ*occurred before any scheduled public test. Originally reported by Lance Ulanoff over at Mashable, the test involved aÂ*startlingÂ*noise that played on hisÂ*HTC Radar 4G that was similar to the alert siren heard when the Emergency Broadcast System is tested on a television, likely taking T-MobileÂ*customers by surprise. Upon checking the screen of theÂ*HTC Radar 4G, Ulanoff discovered the words â
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