In mobile phone communications, the subscriber identification module (SIM) acts as a personal identification marker for a particular user. An integrated service that stores subscriber information, the SIM card has become a ubiquitous feature of mobile phones. SIM cards work with all mobile devices that make use of the Global System for Mobile communications (GSM). In the absence of a SIM card, the mobile device can only dial emergency numbers, such as 911.

1. SIM Cards Explained
Presented by Afghan Wireless

2. In mobile phone communications, the
subscriber identification module (SIM) acts
as a personal identification marker for a
particular user. An integrated service that
stores subscriber information, the SIM card
has become a ubiquitous feature of mobile
phones. SIM cards work with all mobile
devices that make use of the Global System
for Mobile communications (GSM). In the
absence of a SIM card, the mobile device can
only dial emergency numbers, such as 911.
SIM Cards Explained

3. SIM cards can be removed and transferred to
any device on the same network, making it
easy for subscribers to change devices
without losing their contacts and other
information. SIM cards store up to 128
kilobytes of information, which leaves plenty
of room for phone contacts and text
messages. Additionally, SIM cards contain an
international mobile subscriber identity,
security authentication information, and a
unique serial number.
SIM Cards Explained

4. The premier provider of wireless
communications services in Afghanistan,
Afghan Wireless offers a wide range of
affordable phone and SIM card packages.
About Afghan Wireless