About Your Smart Card
February 12, 2002
T-Mobile Device Owner’s Manual
22
3. About Your Smart Card
If you are unfamiliar with Smart Cards or SIM cards, you might be interested to learn more by reading the
following questions and answers:
• Exactly What Information Is on My Device SIM?
• What Happens If I Lose My SIM?
• What Happens If I Put A Different SIM in My Device?
What Is a Smart Card?
A Smart Card is the size of a credit card and contains a SIM card, which is an acronym that stands for
S
ubscriber
I
dentification
M
odule. A SIM is a small card that fits into a slot within your device. The card contains a chip that
holds information required to operate a device.
Exactly What Information Is on My Device SIM?
Your device SIM stores the following information:
•
International Mobile Subscriber Identity (IMSI) Number
- Number that uniquely identifies you as a
subscriber on the network. The number is made up of three parts: a three-digit mobile country code, a
two-digit mobile network code, and a (up to) 10-digit mobile subscriber identify number.
•
Mobile Subscriber ISDN (MSISDN) Number
- Your mobile telephone number. (ISDN stands for
Integrated Services Digital Network.)
•
SIM Lock Code
- A Personal Identification Number (PIN) that you set using the Control Panels > Security
screen. This code protects your SIM from being used by another person in another device in the event it is
lost or stolen.
•
SMS Messages
- Short Message Service messages that you receive and save. T-Mobile Text Messages
messages use the Short Message Service.
Can I Remove My SIM?
Yes, you can; but we recommend you
never
remove the SIM from your device. Without a SIM card, you can only
place phone calls to 611 (T-Mobile Customer Care) and 911 (Emergency). You can also view data that has been
cached in the device memory
.
If you find you must remove your SIM, please follow the directions that follow.
