SIST ETS 300 977 E4:2003

SLOVENSKI STANDARD
01-december-2003
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Digital cellular telecommunications system (Phase 2+) (GSM); Specification of the
Subscriber Identity Module - Mobile Equipment (SIM - ME) interface (GSM 11.11 version
5.9.1)
Ta slovenski standard je istoveten z: ETS 300 977 Edition 4
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 977
TELECOMMUNICATION October 1998
STANDARD Fourth Edition
Source: SMG Reference: RE/SMG-091111QR5
ICS: 33.020
Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM)
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
Digital cellular telecommunications system (Phase 2+);
Specification of the Subscriber Identity Module -
Mobile Equipment (SIM - ME) interface
(GSM 11.11 version 5.9.1)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Internet: secretariat@etsi.fr - http://www.etsi.org
Tel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1998. All rights reserved.

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ETS 300 977 (GSM 11.11 version 5.9.1): October 1998
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Standards Making Support Dept." at the address shown on the title page.

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ETS 300 977 (GSM 11.11 version 5.9.1): October 1998
Contents
Foreword .9
Introduction.9
1 Scope .11
2 Normative references.11
3 Definitions, abbreviations and symbols.13
3.1 Definitions .13
3.2 Abbreviations .14
3.3 Symbols .15
4 Physical characteristics.16
4.1 Format and layout.16
4.1.1 ID-1 SIM .16
4.1.2 Plug-in SIM.16
4.2 Temperature range for card operation.16
4.3 Contacts.16
4.3.1 Provision of contacts .16
4.3.2 Activation and deactivation.16
4.3.3 Inactive contacts.17
4.3.4 Contact pressure.17
4.4 Precedence.17
4.5 Static Protection.17
5 Electronic signals and transmission protocols .17
5.1 Supply voltage Vcc (contact C1).18
5.2 Reset (RST) (contact C2) .18
5.3 Programming voltage Vpp (contact C6).18
5.4 Clock CLK (contact C3) .19
5.5 I/O (contact C7) .19
5.6 States.19
5.7 Baudrate .20
5.8 Answer To Reset (ATR).20
5.8.1 Structure and contents .20
5.8.2 PTS procedure .22
5.8.3 Speed enhancement .23
5.9 Bit/character duration and sampling time .23
5.10 Error handling .23
6 Logical Model .24
6.1 General description.24
6.2 File identifier.24
6.3 Dedicated files .25
6.4 Elementary files .25
6.4.1 Transparent EF .25
6.4.2 Linear fixed EF .25
6.4.3 Cyclic EF .26
6.5 Methods for selecting a file .27
6.6 Reservation of file IDs.28
7 Security features .28
7.1 Authentication and cipher key generation procedure.28
7.2 Algorithms and processes .29
7.3 File access conditions.29

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ETS 300 977 (GSM 11.11 version 5.9.1): October 1998
8 Description of the functions . 30
8.1 SELECT . 30
8.2 STATUS . 31
8.3 READ BINARY .31
8.4 UPDATE BINARY . 31
8.5 READ RECORD. 31
8.6 UPDATE RECORD . 32
8.7 SEEK. 32
8.8 INCREASE. 33
8.9 VERIFY CHV. 33
8.10 CHANGE CHV .34
8.11 DISABLE CHV. 34
8.12 ENABLE CHV. 34
8.13 UNBLOCK CHV . 35
8.14 INVALIDATE . 35
8.15 REHABILITATE. 35
8.16 RUN GSM ALGORITHM. 36
8.17 SLEEP. 36
8.18 TERMINAL PROFILE. 36
8.19 ENVELOPE. 36
8.20 FETCH . 36
8.21 TERMINAL RESPONSE . 36
9 Description of the commands. 37
9.1 Mapping principles . 37
9.2 Coding of the commands . 39
9.2.1 SELECT. 40
9.2.2 STATUS. 43
9.2.3 READ BINARY. 43
9.2.4 UPDATE BINARY. 44
9.2.5 READ RECORD . 44
9.2.6 UPDATE RECORD. 44
9.2.7 SEEK . 44
9.2.8 INCREASE . 45
9.2.9 VERIFY CHV . 45
9.2.10 CHANGE CHV. 46
9.2.11 DISABLE CHV . 46
9.2.12 ENABLE CHV . 46
9.2.13 UNBLOCK CHV. 46
9.2.14 INVALIDATE. 47
9.2.15 REHABILITATE . 47
9.2.16 RUN GSM ALGORITHM . 47
9.2.17 SLEEP . 47
9.2.18 GET RESPONSE . 47
9.2.19 TERMINAL PROFILE . 48
9.2.20 ENVELOPE . 48
9.2.21 FETCH. 48
9.2.22 TERMINAL RESPONSE. 48
9.3 Definitions and coding.48
9.4 Status conditions returned by the card. 50
9.4.1 Responses to commands which are correctly executed . 50
9.4.2 Responses to commands which are postponed. 50
9.4.3 Memory management. 50
9.4.4 Referencing management . 50
9.4.5 Security management. 51
9.4.6 Application independent errors . 51
9.4.7 Commands versus possible status responses . 51
10 Contents of the Elementary Files (EF). 52
10.1 Contents of the EFs at the MF level. 53
10.1.1 EF (ICC Identification). 53
ICCID
10.1.2 EF (Extended language preference) . 53
ELP
10.2 DFs at the GSM application level. 54

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ETS 300 977 (GSM 11.11 version 5.9.1): October 1998
10.3 Contents of files at the GSM application level .54
10.3.1 EF (Language preference).54
LP
10.3.2 EF (IMSI).55
IMSI
10.3.3 EF (Ciphering key Kc) .56
Kc
10.3.4 EF (PLMN selector) .56
PLMNsel
10.3.5 EF (HPLMN search period) .57
HPLMN
10.3.6 EF (ACM maximum value) .58
ACMmax
10.3.7 EF (SIM service table).59
SST
10.3.8 EF (Accumulated call meter).61
ACM
10.3.9 EF (Group Identifier Level 1).61
GID1
10.3.10 EF (Group Identifier Level 2).61
GID2
10.3.11 EF (Service Provider Name).62
SPN
10.3.12 EF (Price per unit and currency table).62
PUCT
10.3.13 EF (Cell broadcast message identifier selection).63
CBMI
10.3.14 EF (Broadcast control channels).64
BCCH
10.3.15 EF (Access control class) .64
ACC
10.3.16 EF (Forbidden PLMNs) .64
FPLMN
10.3.17 EF (Location information) .65
LOCI
10.3.18 EF (Administrative data).67
AD
10.3.19 EF (Phase identification).68
Phase
10.3.20 EF (Voice Group Call Service).68
VGCS
10.3.21 EF (Voice Group Call Service Status) .69
VGCSS
10.3.22 EF (Voice Broadcast Service).69
VBS
10.3.23 EF (Voice Broadcast Service Status) .70
VBSS
10.3.24 EF (enhanced Multi Level Pre-emption and Priority).70
eMLPP
10.3.25 EF (Automatic Answer for eMLPP Service).71
AAeM
10.3.26 EF (Cell Broadcast Message Identifier for Data Download) .72
CBMID
10.3.27 EF (Emergency Call Codes).73
ECC
10.3.28 EF (Cell broadcast message identifier range selection).73
CBMIR
10.3.29 EF De-personalization Control Keys.74
DCK
10.3.30 EF (Co-operative Network List).74
CNL
10.3.31 EF (Network’s Indication of Alerting).76
NIA
10.4 Contents of files at the telecom level .76
10.4.1 EF (Abbreviated dialling numbers) .77
ADN
10.4.2 EF (Fixed dialling numbers).80
FDN
10.4.3 EF (Short messages) .80
SMS
10.4.4 EF (Capability configuration parameters) .82
CCP
10.4.5 EF (MSISDN) .82
MSISDN
10.4.6 EF (Short message service parameters) .82
SMSP
10.4.7 EF (SMS status).84
SMSS
10.4.8 EF (Last number dialled).85
LND
10.4.9 EF (Service Dialling Numbers) .85
SDN
10.4.10 EF (Extension1).86
EXT1
10.4.11 EF (Extension2).87
EXT2
10.4.12 EF (Extension3).87
EXT3
10.4.13 EF (Barred Dialling Numbers).88
BDN
10.4.14 EF (Extension4).88
EXT4
10.4.15 EF (Short message status reports).88
SMSR
10.5 Files of GSM (figure 8).89
11 Application protocol .91
11.1 General procedures .92
11.1.1 Reading an EF .92
11.1.2 Updating an EF .92
11.1.3 Increasing an EF .93
11.2 SIM management procedures .93
11.2.1 SIM initialization.93
11.2.2 GSM session termination .94
11.2.3 Emergency Call Codes.95
11.2.4 Language preference .95
11.2.5 Administrative information request;.95
11.2.6 SIM service table request.95
11.2.7 SIM phase request .95

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11.2.8 SIM Presence Detection and Proactive Polling . 95
11.2.9 Extended Language preference . 96
11.3 CHV related procedures. 96
11.3.1.1 CHV verification if ($CHVBLK$) is supported . 96
11.3.1.2 CHV verification if ($CHVBLK$) is not supported . 96
11.3.2 CHV value substitution . 97
11.3.3 CHV disabling . 97
11.3.4 CHV enabling. 97
11.3.5 CHV unblocking. 97
11.4 GSM security related procedures. 98
11.4.1 GSM algorithms computation . 98
11.4.2 IMSI request . 98
11.4.3 Access control request . 98
11.4.4 HPLMN search period request . 98
11.4.5 Location information . 98
11.4.6 Cipher key. 98
11.4.7 BCCH information. 98
11.4.8 Forbidden PLMN. 98
11.5 Subscription related procedures . 98
11.5.1 Dialling numbers. 98
11.5.2 Short messages. 101
11.5.3 Advice of Charge (AoC). 101
11.5.4 Capability configuration parameters . 102
11.5.5 PLMN selector . 102
11.5.6 Cell broadcast message identifier . 102
11.5.7 Group identifier level 1. 102
11.5.8 Group identifier level 2. 102
11.5.9 Service Provider Name. 102
11.5.10 Voice Group Call Services. 102
11.5.11 Voice Broadcast Services. 103
11.5.12 Enhanced Multi Level Pre-emption and Priority Service. 103
11.5.13 Cell Broadcast Message range identifier. 103
11.5.14 Depersonalisation Control Keys. 103
11.5.15 Short message status report . 103
11.5.16 Network’s indication of alerting. 104
11.6 SIM Application Toolkit related procedures. 104
11.6.1 Initialization procedure. 104
11.6.2 Proactive polling. 104
11.6.3 Support of commands . 104
11.6.4 Support of response codes. 104
11.6.5 Command-response pairs . 105
11.6.6 Independence of normal GSM and SIM Application Toolkit tasks. 105
11.6.7 Use of BUSY status response . 105
11.6.8 Use of NULL procedure byte . 105
11.6.9 Using the TERMINAL PROFILE, ENVELOPE, and TERMINAL
RESPONSE commands . 105
11.6.10 Using the FETCH command. 105
11.6.11 Data Download via SMS-CB. 106
11.6.12 Data Download via SMS-PP. 106
11.6.13 Menu selection. 106
11.6.14 Call Control . 106
11.6.15 Proactive SIM . 106
11.6.16 Mobile Originated Short Message control by SIM. 106
Annex A (normative): Plug-in SIM . 107
Annex B (normative): Coding of Alpha fields in the SIM for UCS2. 108
Annex C (informative): FDN/BDN Procedures . 110
Annex D (informative): Suggested contents of the EFs at pre-personalization . 116
Annex E (Informative): SIM application Toolkit protocol diagrams. 118

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Annex F (informative): Bibliography.125
Annex G (informative): Change history .126
History.127

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Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) of the European Telecommunications Standards Institute (ETSI).
This ETS defines the interface between the Subscriber Identity Module (SIM) and the Mobile Equipment
(ME) for use during the network operation phase of GSM as well as those aspects of the internal
organization of the SIM which are related to the network operation phase, within the digital cellular
telecommunications system (Phase 2/Phase 2+).
This ETS is a GSM technical specification version 5 and is part of the 1996 release of the GSM Technical
Specifications.
The specification from which this ETS has been derived was originally based on CEPT documentation,
hence the presentation of this ETS may not be entirely in accordance with the ETSI/PNE Rules.
Transposition dates
Date of adoption of this ETS: 23 October 1998
Date of latest announcement of this ETS (doa): 31 January 1999
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 July 1999
Date of withdrawal of any conflicting National Standard (dow): 31 July 1999
Introduction
The present document includes some references to features which are not part of the original Phase 2+
release of the GSM Technical specifications. All subclauses which were changed as a result of these
features contain a marker (see table below) relevant to the particular feature. GSM 10.01 will contain
further information about these markers and GSM yearly releases.
The following table lists all new features that were introduced to this document after version 5.5.0.
Changes that were made as corrections to existing featurers are not listed in this table. It should be noted
that following a decision made at ETSI SMG #25 requiring that all specifications containing a release 97
workitem be released as a version 6.x.y. Consequently, new release 97 features approved at or after ETSI
SMG #25 are found only in the version 6.x.y of the present document.
Feature Release Marker
Extended Language Preference 1997 $(ELP)$
Short Message Status reports 1997 $(SMSR)$
Option that a SIM with a disabled CHV can remain unblocked 1997 $(UnBlkSIM)$
Network's indication of alerting in the MS 1997 $(NIA)$
Dialling Numbers and extensions 1997 $(DNE)$
Support of USC2 character set 1997 $(UCS2)$
Mobile Originated Short Message Control by SIM 1997 $(MOSMcontrol)$

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ETS 300 977 (GSM 11.11 version 5.9.1): October 1998
1 Scope
This European Telecommunication Standard (ETS) defines the interface between the Subscriber Identity
Module (SIM) and the Mobile Equipment (ME) for use during the network operation phase of GSM as well
as those aspects of the internal organization of the SIM which are related to the network operation phase.
This is to ensure interoperability between a SIM and an ME independently of the respective manufacturers
and operators. The concept of a split of the Mobile Station (MS) into these elements as well as the
distinction between the GSM network operation phase, which is also called GSM operations, and the
administrative management phase are described in the GSM 02.17 [6].
This ETS defines:
- the requirements for the physical characteristics of the SIM, the electrical signals and the
transmission protocols;
- the model which shall be used as a basis for the design of the logical structure of the SIM;
- the security features;
- the interface functions;
- the commands;
- the contents of the files required for the GSM application;
- the application protocol.
Unless otherwise stated, references to GSM also apply to DCS 1800.
This ETS does not specify any aspects related to the administrative management phase. Any internal
technical reallocation of either the SIM or the ME are only specified where these reflect over the interface.
This ETS does not specify any of the security algorithms which may be used.
This ETS defines the SIM/ME interface for GSM Phase 2. While all attempts have been made to maintain
phase compatibility, any issues that specifically relate to Phase 1 should be referenced from within the
relevant Phase 1 specification.
2 Normative references
This European Telecommunication Standard (ETS) incorporates, by dated or undated reference,
provisions from other publications. These normative references are cited at the appropriate places in the
text and the publications are listed hereafter. For dated references, subsequent amendments to, or
revisions of, any of these publications apply to this ETS only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies.
[1] GSM 01.02: "Digital cellular telecommunications system (Phase 2+); General
description of a GSM Public Land Mobile Network (PLMN)".
[2] GSM 01.04 (ETR 350): "Digital cellular telecommunications system (Phase 2+);
Abbreviations and acronyms".
[3] GSM 02.07 (ETS 300 906): "Digital cellular telecommunications system
(Phase 2+); Mobile Stations (MS) features".
[4] GSM 02.09 (ETS 300 920): "Digital cellular telecommunications system;
Security aspects".
[5] GSM 02.11 (ETS 300 921): "Digital cellular telecommunications system;
Service accessibility".
[6] GSM 02.17 (ETS 300 922): "Digital cellular telecommunications system;
Subscriber Identity Modules (SIM) Functional characteristics".

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ETS 300 977 (GSM 11.11 version 5.9.1): October 1998
[7] GSM 02.24 (ETS 300 923): "Digital cellular telecommunications system;
Description of Charge Advice Information (CAI)".
[8] GSM 02.30 (ETS 300 907): "Digital cellular telecommunications system
(Phase 2+); Man-Machine Interface (MMI) of the Mobile Station (MS)".
[9] GSM 02.86: "Digital cellular telecommunications system; Advice of charge
(AoC) Supplementary Services - Stage 1".
[10] GSM 03.03 (ETS 300 927): "Digital cellular telecommunications system
(Phase 2+); Numbering, addressing and identification".
[11] GSM 03.20 (ETS 300 929): "Digital cellular telecommunications system;
Security related network functions".
[12] GSM 03.38 (ETS 300 900): "Digital cellular telecommunications system
(Phase 2+); Alphabets and language-specific information".
[13] GSM 03.40 (ETS 300 901): "Digital cellular telecommunications system
(Phase 2+); Technical realization of the Short Message Service (SMS)
Point-to-Point (PP)".
[14] GSM 03.41 (ETS 300 902): "Digital cellular telecommunications system
(Phase 2+); Technical realization of Short Message Service Cell Broadcast
(SMSCB)".
[15] GSM 04.08 (ETS 300 940): "Digital cellular telecommunications system
(Phase 2+); Mobile radio interface layer 3 specification".
[16] GSM 04.11 (ETS 300 942): "Digital cellular telecommunications system
(Phase 2+); Point-to-Point (PP) Short Message Service (SMS) support on
mobile radio interface".
[17] GSM 09.91 (ETR 174): "Digital cellular telecommunications system;
Interworking aspects of the Subscriber Identity Module - Mobile Equipment (SIM
- ME) interface between Phase 1 and Phase 2".
[18] CCITT Recommendation E.118: "The international telecommunication charge
card".
[19] CCITT Recommendation E.164: "Numbering plan for the ISDN era".
[20] CCITT Recommendation T.50: "International Alphabet No. 5". (ISO 646: 1983,
Information processing - ISO 7-bits coded characters set for information
interchange).
[21] ISO/IEC 7810 (1995): "Identification cards - Physical characteristics".
[22] ISO/IEC 7811-1 (1995): "Identification cards - Recording technique - Part 1:
Embossing".
[23] ISO/IEC 7811-3 (1995): "Identification cards - Recording technique - Part 3:
Location of embossed characters on ID-1 cards".
[24] ISO 7816-1 (1987): "Identification cards - Integrated circuit(s) cards with
contacts, Part 1: Physical characteristics".
[25] ISO 7816-2 (1988): "Identification cards - Integrated circuit(s) cards with
contacts, Part 2: Dimensions and locations of the contacts".
[26] ISO/IEC 7816-3 (1989): "Identification cards - Integrated circuit(s) cards with
contacts, Part 3: Electronic signals and transmission protocols".

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ETS 300 977 (GSM 11.11 version 5.9.1): October 1998
[27] GSM 11.14: "Digital cellular telecommunications system (Phase 2+);
Specification of the SIM Application Toolkit for the Subscriber Identity Module -
Mobile Equipment (SIM - ME) interface".
[28] GSM 11.12 (ETS 300 641): "Digital cellular telecommunications system
(Phase 2); Specification of the 3 Volt Subscriber Identity Module - Mobile
Equipment (SIM - ME) interface".
[29] GSM 02.22: "Digital cellular telecommunications system (Phase 2+);
Personalization of GSM Mobile Equipment (ME) Mobile functionality
specification".
[30] ISO 639 (1988): "Code for the representation of names of languages".
[31] ISO/IEC10646: "Universal Multiple-Octet Coded Character Set (UCS); UCS2, 16
bit coding".
3 Definitions, abbreviations and symbols
3.1 Definitions
For the purposes of this ETS, the following definitions apply. For further information and definitions refer to
GSM 01.02 [1].
access conditions: A set of security attributes associated with a file.
application: An application consists of a set of security mechanisms, files, data and protocols (excluding
transmission protocols).
application protocol: The set of procedures required by the application.
card session: A link between the card and the external world starting with the ATR and ending with a
subsequent reset or a deactivation of the card.
current directory: The latest MF or DF selected.
current EF: The latest EF selected.
data field: Obsolete term for Elementary File.
Dedicated File (DF): A file containing access conditions and, optionally, Elementary Files (EFs) or other
Dedicated Files (DFs).
directory: General term for MF and DF.
Elementary File (EF): A file containing access conditions and data and no other files.
file: A directory or an organized set of bytes or records in the SIM.
file identifier: The 2 bytes which address a file in the SIM.
GSM or DCS 1800 application: Set of security mechanisms, files, data and protocols required by GSM or
DCS 1800.
GSM session: That part of the card session dedicated to the GSM operation.
IC card SIM: Obsolete term for ID-1 SIM.
ID-1 SIM: The SIM having the format of an ID-1 card (see ISO 7816-1 [24]).
Master File (MF): The unique mandatory file containing access conditions and optionally DFs and/or EFs.

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ETS 300 977 (GSM 11.11 version 5.9.1): October 1998
normal GSM operation: Relating to general, CHV related, GSM security related and subscription related
procedures.
padding: One or more bits appended to a message in order to cause the message to contain the required
number of bits or bytes.
plug-in SIM: A Second format of SIM (specified in clause 4).
proactive SIM: A SIM which is capable of issuing commands to the ME. Part of SIM Application Toolkit
(see clause 11).
record: A string of bytes within an EF handled as a single entity (see clause 6).
record number: The number which identifies a record within an EF.
record pointer: The pointer which addresses one record in an EF.
root directory: Obsolete term for Master File.
SIM application toolkit procedures: Defined in GSM 11.14 [27].
3.2 Abbreviations
For the purpose of this ETS, the following abbreviations apply, in addition to those listed in GSM 01.04 [2]:
A3 Algorithm 3, authentication algorithm; used for authenticating the subscriber
A5 Algorithm 5, cipher algorithm; used for enciphering/deciphering data
A8 Algorithm 8, cipher key generator; used to generate K
c
A38 A single algorithm performing the functions of A3 and A8
ACM Accumulated Call Meter
ADN Abbreviated Dialling Number
ADM Access condition to an EF which is under the control of the authority which
creates this file
ALW ALWays
AoC Advice of Charge
APDU Application Protocol Data Unit
ATR Answer To Reset
BCCH Broadcast Control CHannel
BCD Binary Coded Decimal
BDN Barred Dialling Number
BTS Base Transmitter Station
CB Cell Broadcast
CBMI Cell Broadcast Message Identifier
CCITT The International Telegraph and Telephone Consultative Committee (now also
known as the ITU Telecommunications Standardization sector)
CCP Capability/Configuration Parameter
CHV Card Holder Verification information; access condition used by the SIM for the
verification of the identity of the user
CLA CLAss
CNL Co-operative Network List
DCK De-personalization Control Keys
DCS Digital Cellular System
DF Dedicated File (abbreviation formerly used for Data Field)
DTMF Dual Tone Multiple Frequency
ECC Emergency Call Code
EF Elementary File
ETSI European Telecommunications Standards Institute
eMLPP enhanced Multi-Level Precedence and Pre-emption Service
etu elementary time unit
FDN Fixed Dialling Number
GSM Global System for Mobile communications
HPLMN Home PLMN
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ETS 300 977 (GSM 11.11 version 5.9.1): October 1998
IC Integrated Circuit
ICC Integrated Circuit(s) Card
ID IDentifier
IEC International Electrotechnical Commission
IMSI International Mobile Subscriber Identity
ISO International Organization for Standardization
Kc Cryptographic key; used by the cipher A5
Ki Subscriber authentication key; the cryptographic key used by the authentication
algorithm, A3, and cipher key generator, A8
LAI Location Area Information; information indicating a cell or a set of cells
lgth The (specific) length of a data unit
LND Last Number Dialled
LSB Least Significant Bit
MCC Mobile Country Code
ME Mobile Equipment
MF Master File
MMI Man Machine Interface
MNC Mobile Network Code
MS Mobile Station
MSISDN Mobile Station intern
...