Item Notes Description
Verified New
PIN Code
Required field. Re-enter the new PIN Code to confirm the new PIN
Code.
Apply Button Click the Apply button to change the old PIN code to
the new PIN code.
Cancel Button Click the Cancel button to cancel the changes and
keep current PIN code.
Table 229 – Change PIN Code
Important – When you change the PIN code for the SIM card, you must also change the corresponding PIN code specified in the
Basic Network | WAN & Uplink | Internet Setup | Connection with SIM Card page.
8.1.4 USSD
Unstructured Supplementary Service Data (USSD) is a protocol used by GSM cellular telephones to communicate with the
service provider's computers via instant bi-directional communication. USSD can be used for WAP browsing, prepaid call-
back service, mobile-money services, location-based content services, menu-based information services, and as part of
configuring the phone on the network.
A USSD message can be up to 182 alphanumeric characters in length. Unlike Short Message Service (SMS) messages, USSD
messages create a real-time connection during an USSD session. The connection remains open, allowing a two-way exchange
of data. This makes USSD more responsive than services that use SMS.
USSD Scenario
Figure 368 – USSD Scenario
USSD allows you to have an instant bi-directional communication with your carrier. In the diagram above, the USSD
command ‘*135#’ refers to data roaming services. After sending that USSD command to your carrier, you will see a response
on the USSD Response window. Please note the USSD command varies for different carriers.
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