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Probably something below 20 Hz. They are done with rotating motors with unbalanced shafts. Here is a page that shows lots of products.
http://www.precisionmicrodrives.com/vibration_motors.php?_kk=cell%20phone%20vibrator%20motor&_kt=c8a02ca2-cd5f-4ac0-918f-9e11e3edc018&gclid=CNv2td_zuJ4CFQ8eDQodfUIwmA
My guess is the shaft spins on the order of 5 or 20 rev/sec - giving a fundamental frequency of 5 to 20 Hz. Maybe 10 Hz...
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