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I got an alert in Georgia yesterday. I think a kid went missing. I wish they set it up where if you touch the alert you get the full story of the reason for the alert. In my case it just went away when I switched the phone on.
 
I think it does, I've seen the settings in my friend's iPhone (on Verizon) in Notification Center, but I do not have it on AT&T.

Stay safe!

So I guess it's up to the carriers to participate in this? If so, it doesn't surprise me that ATT isn't yet.
 
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