| description | SIM cards have to main categories CDMA / GSM here i am focus on GSM SIM cards. This cards have two types of charging system PREPAID and POSTPAID. |
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The format of the ICCID is: MMCC IINN NNNN NNNN NN C x
MM = Constant (ISO 7812 Major Industry Identifier)
CC = Country Code
II = Issuer Identifier
N{12} = Account ID ("SIM number")
C = Checksum calculated from the other 19 digits using the Luhn algorithm.
x = An extra 20th digit is returned by the 'AT!ICCID?' command, but it is not officially part of the ICCID.
PREPAID
Prepaid cards already have a tax plan assigned to them
POSTPAID
SIM cards hold a profile mapped by the network operator, these cards have a storage capacity 8k,16k,32k128k,etc...
MF - Master Files
DF - Dedicated Files
EF - Elementary Files
Standards : GSM 11.11 - 3GPP 51.011
Network Requirements
- MCC / MNC
- IMSI
- ICC-ID
- SMS Parameters
Marketing Requirements
- Phonebook
- Number of Short Messages
- Service Dialing Number (Customer Care Numbers
- Mailbox Number
Business Requirements
- Roaming Partner List
- PIN Handling
ICC-ID
ICC
- SIM - Single IMSI or Dual IMSI
- RUIM - Single CDMS or Combo CDMA+GSM
ICC-ID is defined by ITU-T E.118
The ICC-ID has 19 digits and calculated using Luhn algorithm.
89-91-15-100-000000011-8
89 - Tele
91 - CC
15 - MNC
100 - Vendor
000000011 - Serial Number
8 - Checksum
IMSI
International Mobile Subscriber Identity
The IMSI has 15 digits and is unique across all globe and indicates the home network of the subscriber.
MCC + MNC + MSIN = IMSI
MNS + MSIN = NMSI
SIM Keys