A

AMC ASAP ASI ATM ADCA API

B

BBA BBC BCA BDO BE BHMS BPO BSC BYE

C

CAA CAB CBI CBSE CC CCC CCTV CDS CEO CGPA CID CMA Computer COVID-19 CPU CRM CRPF CSE CSIR CSR CTC CV CIDR CSS

D

DGP DIY DM DNA DNS DP DRDO DSLR DVD DDR

E

ESI EEPROM

F

FBI FICCI FIFA FIFA FIR FUP

G

GATE GDP GIS GMT GPRS GPS GRE GSLV GST

H

HD HDFC HIV HMM HR HSBC HTML HTTP

I

IAS IBM ICC ICDS ICICI ICMR IDBI IFS IFSC IG IGST IIT IMAO IMF IMPS India INR IPC IPO IPS IRS IS ISC ISD ISIS ISO ITC ITI IUPAC IVF IDC IRL

J

JCB JEE JPEG

K

KFC KGF KYC

L

LAC LCD LLB LOL LPG

M

MBA MBBS MC MCA MRI

N

NABARD NCR NCRT NDA NEET NEFT NTPC

O

OK OP OPD OTG OTT

P

PAN PCOD PCS PDF PH PHD PNG POK PS PUC PWD

R

RIP RSVP RTI RTO

S

SAP SI SMS SOP SOS SP SSC SSD STD

T

TB TBH TCS Teacher TRP

U

UAE UNESCO UNICEF UNO UPI UPS UPSC URL

V

VIP

W

Wi-Fi

X

X- RAY JBL Full form KAS Full Form LPT Full Form in Computer PFP Full Form Programmable Logic Controller(PLC) SWAT FULL FORM TRAI Full Form What is the full form of IMDB? What is the Full Form of WMO Convolutional Neural Network (CNN) FIAT FULL FORM FULL FORM OF IG IN INSTAGRAM FULL FORM OF NTRO Indian National Army(INA) NYKS FULL FORM NDMA Full Form What is DSC's full form? What is the Full Form of EOD? WIPRO Full Form YONO Full Form BFF’s Full Form BRICS Full Form Full form of BSF Full form of CBS Full form of DRS Full form of FAO Full Form of NIA ISP Full Form LTE Full Form NDMA Full Form What is DSC's full form What is the Full Form of EOD WIPRO Full Form YONO Full Form SCSI Full Form Full Form of MEA SJVN full form Full Form of ROM Full form of SBI Full form of SIM Full Form of UNO ICT FULL FORM MICR FULL FORM MRP FULL FORM CISF Full Form Full Form Of BTS ARMY Full form of COBOL FULL FORM OF RADAR What is the Full Form of NSSO What is the Full Form of VPN? What is Full Form of PHC What is the Full Form of GAIL SOS Full Form in WhatsApp DGCA Full Form DSLR FULL FORM ICAO FULL FORM Full form of IMEI Full form of CDN Full form of OTG Bash Full Form CDMA Full Form Full form of CBSSBI Full form of MLA

Full form of SIM

The Subscriber Identification Module, or SIM, is the complete form of the term. The SIM, or international mobile subscriber identity, is a built-in circuit and portable chip that securely contains the IMSI. We can make phone calls to anyone in the world with an intelligent memory card as long as the user's contact network remains consistent.
GSM networks that are managed and operated by smartphones typically employ SIM cards. Any user with an electronic device capable of supporting this can utilize it because it is movable.

Past Events

Munich-based smart card manufacturer Giesecke and Devrient produced the first SIM card in 1991. The European Telecommunication Standards Institute was the organization that first acknowledged and announced the SIM.

The SIM card's function

In addition to storing a large amount of data, a SIM card also transmits and receives vital information amongst its network of users and retains some of their private and personal information. The list of data that SIM stores is

  • Details of the address
  • SMS texts
  • Keys to personal security
  • Telephone number
  • Information about network permission.
  • Other data.

The following is a list of some important data that SIM carries.

  • Information about security
  • IMSI (International Mobile Subscriber Identity)
  • unique serial number
  • A summary of the local network.

Dimensions of the SIM


When SIMs were initially manufactured, they were around the size of credit cards; however, later disclosures of the SIM's dimensions revealed that its capacity was 15 mm by 12 mm. Different nano- and micro-SIM chip sizes are currently used in some devices.

Contents of a SIM.

It has an IMSI number, or International Mobile and Subscriber Identity, a unique number that serves as a serial for it, features for identification and authentication, network data that is momentarily saved, and ciphering information. A SIM is secured with a PUC (personal unblocking code) to enable PIN unlocking, and it also contains a record of the services that customers have used. PIN and PUK unblocking keys are four to eight-digit passwords that are used to protect the SIM from unauthorized use. But it's not always necessary to use a PIN.

By simply moving the SIM card to the phone he is using, a user can use any SIM card that they own. These cards are also used in satellite devices, smartwatches, and other gadgets.

SIM structure and memory hierarchy

The Subscriber Identity Module's memory structure is similar to that of a device's directory.
The file system used by SIM consists of three files: a directory file (DF), an elementary file (EF), and a master file (MF).

Master file:

The master file (MF), or what you can call its roots, is the foundation of the file system. The fundamental directory seen in any other OS (operating system) is fairly similar to the master file. It's not required that this file be an EF (elementary file). In the SIM file system, there may be one or more dedicated files.

Dedicated file:

Dedicated files, sometimes known as dedicated files DF, are the MF's subdirectory or subordinate folders. The GSM11.11 standards define the features and the consistent data of specialized files.
A two-byte identifier is used to identify the specialized files. The same class includes the phonebook elementary files as well.

Elementary file:


Under the SIM memory hierarchy settings, elementary files are located underneath dedicated files. Consider the fundamental files to be the file system's leaf node.

It is crucial to remember that only the elementary files store data; all other files in the file system have headers. The first byte of the header, which also includes information on the file system's structure, identifies the type of file.

Within the body of the elementary files is contained application-related data.
The file structure may be categorized as administration- or application-specific. The operating system decides who can access the stored data.

Advantages of SIM

The advantages of a subscriber identity module card are as follows:

  • This tiny smart card has many more things in addition to your contact number and the phone numbers of your connections in a phonebook.
  • This little card is readily accessible and movable between phones.
  • The SIM card contains files that are protected by a PIN lock, which is frequently provided by the provider. But you can access the PIN change.