perhaps you want to own one jumbo jammer bag
Most of the smartphone users are connecting free Wi-Fi hotspots in public places and use them not only to surf the web, but to install updates and processing their mobile banking information. Malwares can be hidden not only in games but in a lot of other applications. Some of them will want a permission to be installed on your phone, that is why be careful what you download and install. This will make your phone unusable. Having an affected smartphone will also make your bill bigger because some of the malwares start sending SMS or MMS messages without your permisssion. There are cases in which it can start even international calls.
There are also malware which changes your icons with images of skulls in order not to know where which application is. Not only that but some bad softwares change the color of the text and the background of the phone in black. Nowadays gsm jammer are widely spread and one can easily buy the necessary equipment over the Internet. There are even discounts and free delivery. There are various kinds of Jumbo Jammer Bag, which are designed for work in cars and buildings. In most cases it is a small box with a microphone, GSM transceiver and a battery.
Then you will simply have to activate the bug by calling its phone number, some of those eavesdropping bugs are able to work for weeks and it senses sounds from 10-15 meters (30-50 feet). The main problem of those devices are power consumption, because it influence the working time of the bug directly. They solve that problem by keeping the bug turned of, until it detects any noise in the area.The only thing you'll need to do to make that bug work is to insert a SIM card in it and turn it on. By doing this you assign a certain phone number to the bug and enable it to use a GSM networks of different mobile carriers.