http://www.comstrac.com/ .ComsTrac Limited specialises in providing professional surveillance and protection equipment for Law Enforcement Agencies, supplying all forms of communication intercept systems, for GSM, CDMA, Satellite, Computer and Standard Telephone Communications.

1. Know About GSM Technology
GSM stands for the Global Process for Mobile Communications. GSM is a worldwide cell-
phone frequency utilized by most of the major networks. In point of fact in case you have a
quad-band GSM mobile phone then you have a world phone as it will most likely work
anywhere on Earth. GSM is currently the most popular mobile phone network
infrastructure on the globe. GSM represents a knowledge transmission infrastructure that
is available to giant selection of people in plenty of different circumstances. Global System
for Mobile (GSM) is a second generation cellular standard developed to cater voice services
and data delivery using digital modulation.
How GSM Works
GSM networks come into play when it comes to actual tracking. When and if the
phone is turned on, these networks capture the signal, then sends it to the satellite for
processing.

2. and the satellites sends the data to the person with the query. There is a need of network
service providers, those who enable communication between mobile phones, as well. The
phone must have a SIM card installed which connects to the service provider network as
often these networks double up as GSM networks. Using these combinations, the actual
location of the GPS GSM enabled phone can be known.
Characteristics of GSM
 Fully digital system using 9000 1SOO MHz frequency band.
 User terminal authentication for fraud control.
 Encryption of speech and data transmission over the radio path.
 Full international roaming capability.
 Low speed data services.
 Compatibility with ISDN.
 Support of Short Message Service (SMS).

Features Provided by GSM
 Calling Line ID - Incoming telephone number displayed
 Alternative Line Service -one for personal calls
- one for business calls
 Closed User group - call by dialing last for numbers.

3.  Advice for Charge- tally of actual costs of phone calls.
 Fax & Data - virtual office/professional office
 Roaming - services and features can follow customers from market to market.
Advantages of GSM Technology
 Crisper, cleaner quieter calls.
 Security against fraud and eavesdropping.
 International Roaming capability in over 100 countries.
 Efficient use of spectrum.
 A wide variety of handsets and accessories.
 Ease of use with over the air activation, and all account information is held in a
smart card which can be moved from handset to handset.
 Advanced features such as Short Messaging and caller ID.
Disadvantages of GSM
 In case of GSM, SIM cards, individual authentication keys of the users are stored in
the authentication centers.

4.  Any person with the rights and qualifications to access to authentication center can
manipulate these to impersonate that mobile user.
 Security algorithms used in GSM e.g. A3, A5, and A8 are all undisclosed algorithms.
But researchers have proved that these algorithms cannot guarantee 100% security.
 Privacy of a call and mystery of a subscriber are only assured on the air interface
among the mobile station and the base station subsystem leading to likelihood of
eavesdropping of voice data.
GSM Tracking devices are now a actual contender when it comes to choosing what to
select up on your way out of the house. Keys, wallet, phone & tracker! Imagine being able to
study your kids' safety from the office or find your automobile in a few seconds in the
airfield automobile park. To know more about GSM Tracking just visit our site
http://www.comstrac.com/.