Bosch GSM 1900 User Manual

Closed user group
This is a network feature by which the use of your
telephone is restricted to certain phone numbers
within a group defined by the network operator
and the owner of the SIM card. You may be a
member of different groups. Each group has its
own ID number. The network defines which
group is your default user group. You have the 
option of calling outside the group – perhaps at a
higher charge.

Outgoing call identification
You can select whether you want your phone
number to be shown or not at the next outgoing
call. In Network Service select the option  

, then

and confirm

your choice by pressing  

.

Line selection
Some network operators offer Alternate Line 
Service. This allows you to have two separate 
speech lines and phone numbers on the same 
telephone. 

Unstructured supplementary services (USSD)
On some networks you have the possibility of
sending unstructured supplementary service 
strings. An USSD service string should always be
terminated by pressing the 

-key.

In order to be able to send USSD service strings
you must enter the Phone setup menu and select

. Pressing the relevant

keys 0 to 9 for one second will lead you to the 
alpha mode enabling you to enter letters and di-
gits instead of only digits. 

Contact your network operator for further infor-
mation on these supplementary services.

User Guide 738/718 GB  29/04/99 9:59  Side 30