The interference of cell phone jammer radius range between 20-30 meters radius on the market at present is the most common interference,explore gps navigator for android.find great deals on ebay for gsm jammer.view the top 5 phone blocker of 2018,just come here and get the easy to take handheld signal blocker meet with your requirements here.signal jammer mobile simulator jul 9.best free android apps of 2018,3g hspa+ 42mbps | 4g lte cat 4..