The document describes a sniffer device that can detect and locate lost mobile phones. The sniffer works by creating a small base station that operates at a different frequency than mobile networks. It includes a transceiver, directional antenna, and software to store and check IMEI numbers of lost phones against those in its database. When a lost phone is powered on near the sniffer, it can detect the phone's IMEI number and track its location using GPS. While complex, the sniffer provides an effective and low-cost solution for large-scale detection of lost mobile phones.

1. Snifferfor detecting lost mobile
By Stelcy Jose

2. What Happens when you lost your
Mobile Phone?

3. Reporting…Searching… Praying…

4. But still not found?

5. What is the best Solution then?

6. What is the best Solution then?What is the best Solution then?
Sniffer

7. What Sniffer actually has?

8. Sniffer has?Sniffer has?
Small Base Station
Plays major role
Transceiver section
operated at frequency (different)
Directional antenna
Includes:

9. contentscontents
➢Introduction
➢About IMEI
➢Designing for the Sniffer
-Sniffer base station
-Design of unidirectional antenna
-software for the tracking
➢Working of the sniffer device
➢conclusion

10. What is Sniffer ?What is Sniffer ?
The main scope is to detect the lost mobiles.
For the detection of lost mobile SNIFFER plays a vital
role.
The Sniffer is basically a transceiver that works in the
different frequency that we are commonly used.
The sniffer device has to be designed for easy mobility
for the purpose of detection.

11. What is IMEI?(International Mobile Equipment Identifier)

12. International Mobile Equipment Identifier
•
15 digit Unique code used to identify GSM phone
•
Used for blocking of call made by unauthorized person
When a phone is switched on, this unique IMEI number
is transmitted and checked against a data base of
black listed phones in the network’s EIR .
To know the IMEI number the *#06# has to be pressed.
We use IMEI EFFECTIVELY in SNIFFER For the purpose of DETECTON

13. Gray List
Allow the Phone to be used, but can be
tracked to see who has it.
Black List
Listing the phone from being used on any
number where there is an EMI match

14. 1. Sniffer base station.1. Sniffer base station.
2. Unidirectional antenna.2. Unidirectional antenna.
3. Tracking software.3. Tracking software.
DESIGNING FOR THE SNIFFERDESIGNING FOR THE SNIFFER

15. Designing for the Sniffer - Sniffer Base Station
•
Small base station
•
Include transceiver section
•
Operated at frequency (900mhz which is VHF range)it is
necessarily to design the oscillator circuit for that frequency
range
•
Important is cooling
•
Low power transmitter (help in nature)

16. Designing for the Sniffer - Design Of Unidirectional Antenna
•
Act as a eyes for the sniffer
•
Antenna is a device works at specified frequency
•
Transmitting & receiving data signal
•
Transmit power
•
Used to show radiation pattern
(Unidirectional Antenna Radio Pattern)

17. Designing for the Sniffer - S/W for the Tracking
•
Feature: help to create database using RAM
•
IMEA - embedded in a chip
•
RAM stores - IMEI no.
•
Act as a database

18. Designing for the Sniffer - S/W for the Tracking
RAM
IMEI Number
Lost mobile
Signalling information
Programming done-c/java
Front end-VB
Back end- oracle SQL
i/p
checks
s/w got

19. If the connection of the lost mobile is Established with the BTS, The MSC
collects it’s IMEI number.
If these number are matched with the reported lost no’s .
It transferred the connection to the sniffer device.
Searching can perform with the GPS system for more accurate , fast
detection and location can be tracked.
WORKING OF THE SNIFFER DEVICE

20. Before Sniffer Increase The Frequency

21. After Sniffer Increase The Frequency
IMEI no. provided by MTSO or MSC
BTS(base transceiver station)-act as a middle man
MTSO(mobile telephone switching office)=MSC(mobile switching centre)
The connection of the sniffer device with the lost mobile phone.

22. Sniffer tries to Communicate with the Lost Mobile
The sniffer shown in fig tries to communicate with the lost mobile. After
getting connected with the mobile it creates a virtual cell pattern and thus
helps in the detection of lost mobile phones.

23. Is browser sniffing the only viable approach
for mobile device detection?

24. ➢
Useful for lost mobile
➢
effective cost
➢
low power consumption
➢
easy to design
ADVANTAGES

25. ➢
Power of mobile should be good enough
➢
Mobile should not been in shadow regain
Note: “Method can been improved by using modern technology and devices”
Certain boundaries :Certain boundaries :

26. Conclusion

27. In today’s life Mobile phones are the mainly used device for
communication ,so large no. of complaints regarding the mobile
phone that lost are comes.
This method appears to be complex but for large scale detection
the overall effective cost of the design down.
There are certain boundary conditions like the power of the
mobile should be good enough etc.. but this method can be
improved by using modern technologies.

28. THAN ”Q”