5. IMEI(international mobile equipment identity
IMEI Is a unique 15 digits numbers assigned to all mobile devices
We can use this number to block the mobile phone from being used by the another person
In fact each GSM Mobile Phone is assigned a unique IMEI code when it is produce
The IMEI is used for security purpose such as to identify a stolen equipment and for the prevention of
unauthorized access to the network
If you know the IMEI of the Mobile Phone you can check information regarding to manufactures , model
,type ,date , and country
According to the GSM specification IMEI has total length of 15 digits
6. Imei(international mobile equipment identity
IMEI is stored on the Hardware of Mobile Station
Used to check the validity of MS
The same number is stored to check number compliance
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15. MSISDN(Mobile Station International Subscriber
Directory Number
Real telephone number of the subscriber
Subscriber can have several MSISDNS
Store centrally in the HLR and SIM
16. The international telephone of mobile subscriber GSM customer is his/her mobile subscriber
ISDN number
The number is only store in HLR of the home network and never intended to be transmitted
over the air interface
17. First dial of prefix that is distinguish between national and international calls
The second part of the MSISDN is CC(Country Code) for the relevant country 37 this not have to be dial
when making national calls
Third part is network destination code it identifies the appropriate national operator
The 4th part is SN (Subscriber Number) which form the full path of the MSISDN the first three digits 123
determine the logical HLR with GSM customer store and which is used to locate his/her
The remaining digits identifies the subscriber with different service like fax ,speech , and data services
require different SN
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28. TMSI(TEMPORARY MOBILE SUBSCRIBER IDENETITY
Used in placed of IMSI for definite identification and addressing of MS
Assigned during the MS presence in the area of one VLR and usually changed during this period(ID
HOPPING)
Store by MS on the SIM card
Stored on the network side only in VLR not in HLR
Is assigned in operator specific way and consist of 4*8 bits
Subscriber can be uniquely identified
IMSI is replaced by(TMSI ,LAI
29. TMSI(TEMPORARY MOBILE SUBSCRIBER IDENETITY
TMSI and LAI are required for location update ot the MS
TMSI is generated in VLR in relevant hosting network after the first location
update and then link to IMSI
The IMSI is transmitted along for the data security reason
Instead the TMSI is transmitted via the air interface
TMSI is a temporary identity for the mobile radio user
It is assign for the mobile presence within the location
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36. Lai (Location area identity)
s the unique number worldwide
Internationally unique identification of an LA
Regularly broadcast by the Base Station
Heard by the Mobile the Station in order to decide whether or not a new LA has been entered
The net send it by the control channel via the air interface to the MS
The MS recognize its current position and can store it in the SIM
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41. IMSI(INTERNATIONAL MOBILE SUBSCRIBER IDENTITY
Uniquely identifies the subscriber and is stored in the SIM card,HLR, and the
AUC
To identify a GSM customer subscriber in a mobile network each subscriber
has its own international Mobile Subscriber Identity (IMSI)
The IMSI is the standard link of the 15 digits and composed of the following
elements