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Thread: "Morse code" like sound on phones?
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Old Oct 26, 2006 | 8:09 pm
  #2  
kanebear
 
Join Date: Aug 2001
Location: A Southern locale that ain't the South.
Programs: Bah, HUMBUG!
Posts: 8,014
That's GSM signalling. CDMA doesn't do that but IS-136 (old AT&T/Cingular 'Digital') does. Very good ear, it's a 217 Hz signal which is the frame repetition rate. IS-136 is 50Hz. So if you hear that noise, look around for someone with a T-mobile/Cingular device. It's them sending a text/getting a text/using data, etc.
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