The matching with cell phone jammer whose radius is adjustable

What is a "firewall"?
"Firewall" is a system or a group, it can enhance the body's internal security, firewall system determines which internal services can be accessed outside; the outside world who can access which services internal and external service which can be internal staff access. The matching with cell phone jammer whose radius is adjustable (i.e. the power is adjustable) should be considered according to the site situation.First appeared in the computer field, and now this concept has also been ported to the phone program, but with traditional firewalls have some differences, mainly referring to shield part of the call number, for personal information encryption.
Call Firewall
Effective blacklist: blacklist list screen call number information.
White List effective: only receive the white list in the number of incoming calls.
SMS firewall:
Option One:
Effective blacklist: blacklist numbers mask the short message sending.
The matching with the directional antenna of   china cell phone jammer to control the main emission area (direction) of the shielding signal can also be considered.White List effective: only receive the list of numbers to the white list to send a short message.
Option Two:
If you start this function, user-defined preset number list ("spam list of numbers"), mobile phone text messages will be automatically identified as "spam", and was temporary in the junk mailbox. Users can also throw a message in the inbox to the trash.
Private Firewall:
Users can personal photos, pictures, music, documents and other personal information is encrypted.
What is the "Push to talk?"
A cell phone in one-way communication capabilities, allowing users to users with one or another group call. Just press a key on the phone.Influence from human factor and normal machine loss should be considered for  cell phone jammer . In a group, need to press the 'PTT' key to make a call, the order of 'first come first served'
Phone out of service analysis
Always have a friend to me for advice, why call others, or others to call their own, we often encounter "mobile phone is not in service area" of the situation, or sometimes on the phone during the call will suddenly interrupted, and some short message when there are delayed or not received by the phenomenon, which is what causes it?
Poor cell phone signal is usually caused by the network, which may also lead to SMS delays and other issues. It is not just a painting, but also   cell phone jammer at the same time. Cause dropped calls due to network problems generally have the following reasons.
First, the phone will result in a signal blind "is not in service area" or call interruptions, including network coverage of this blind spot outside, such as suburban and rural areas have not yet build a network of local communications facilities, and by the shield of the city block and cell phone coverage the place, such as in an elevator, underground places, buildings and other places.
Second, the signal is poor due to interference caused by the phenomenon. As the mobile phone signal is received by the electromagnetic wave propagation to work, the base station by transmitting radio waves and a link between mobile phones, so as to achieve the purpose of voice calls.
Therefore, the interference of electromagnetic waves mobile phones will have a negative impact.   cell phone jammer can effectively disable all cell phone. When the air of some electromagnetic interference exceeds a certain level, the phone's signal to noise ratio reduces to the standard value, the phone will be no signal or dropped the case. So consumers can send a powerful electromagnetic waves away from the best equipment, to place a small disturbance call.