... radius still depends on the strength signal in given area Mobile signal shielding device Specifications: Tx Frequency (A)TX frequency 869 ... Available system Include analog (AMPS,TACS,NMT) and digital (GPRS,GSM, DCS,CDMA,PDC,TDMA,PHS,PCS,IDEN,W-CDMA,UMTS ... , cinema, theater, and hospital etc.2. At places where using mobile phones is prohibited such as government, military, finance, security, police and ...