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Now known as the Personal Localized Alert Network (PLAN), this national system will allow, when fully operational,the dissemination of local law enforcement emergency alerts, Amber Alert child abductions, natural disasters, terrorist attacks and presidential alerts.

The service requires a special cellphone chip and software.Phone service carriers say they're on board and the plan is to have the chip and technology widely available by the end of 2012, according to one report.

More on PLAN (formerly known CMAS or Commercial Mobile Telephone Alerts)