Magnetic coupling to GSM nodules of cellular phone.

Hi Folks,

Here I have a GSM RF module or system shield with shield can. It has IF VCO and its TX IF frequency: 640 MHz and 80MHz (640 by divider to 80).
And I have little choice but to put vibrator on top of RF shield can.

Here now I have no idea about magetic flux or H field induced by normal vibrator inside ? Will "u" value be different over frequenies ? Meaning that u = 1 or larger than 1 to induce H/EM wave that can interfer IF frequency of this GSM RF system ?

Anybody had similiar experience before ?
Or how can we define induced EM wave power by different "U". It's a kind of
troublesome, pls helps !