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An emergency FEMA alert test will sound Oct. 4 on all U.S. TVs, radios and cellphones
(www.cbsnews.com)
This is a most excellent place for technology news and articles.
Airplane mode will work. The alerts are sent out via the mobile network. When airplane mode is turned off there is a good chance the alert will sound. There was a tornado that went through my area, the basement had no cell signal, as we were all coming out from the basement everyone's phones started going off.