Ericsson T28z User Manual page 111

Short Message Service (SMS)
allows messages of up to 160 characters to be sent and received via the
network operator's message center to your mobile phone. Messages are stored
if the phone is off or out of reach ensuring that they reach you. To use this
service, it must be supported by your network.
SIM card
Subscriber Identity Module card – a card that must be inserted in any GSM-
based mobile phone. It contains subscriber details, security information and
memory for a personal directory of numbers. The card can be a small plug-in
type or credit card sized but both types have the same functions. The T28z
uses the small plug-in card.
Subscription
is the contract that you have with the service/network provider. To use your
phone, you need to have a subscription to a network. You get a SIM
(Subscriber Identity Module) card with your subscription. The services
included in your subscription depend on your choice of operator and/or
subscription. So some of the services and functions described in this manual
may not be accessible to you. If you want a complete list of the services
included in your subscription, please contact your network operator.
Two Line Service
enables you to have two lines and two different phone numbers on one
subscription for your mobile phone. This makes it possible to have separate
numbers for business and personal calls. To use this service, it must be
supported by your network.
110 Glossary