In my last message I was wrong.  Some phones have the Vibrating option,  
Morotola's Micro Tac phones and some others can use a vibrating battery.  The 
most universal option is from Cellular Works ( 1-800-235-5967 ),
Item # 19VIBRATOR   $24.95.  This decive is about 2.5" x 1.25" and when 
within 
3 feet of your phone will vibrate when your phone rings.
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