How to block a cell signal - how to jam bluetooth signal with android

How to block a cell signal,how to jam bluetooth signal with android,d_10px pad_l_28px big allborder"> Product Specifications: Car GPS Signal Jammer 3 To 6 Meters Coverage Main Feature: Car GPS Jammer 3 To 6 Meters Coverage Working Band: L1 system 1450 to 1600Mhz ...