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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
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.
NTC-400 Series
Figure 368 – USSD Scenario
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© NetComm Wireless 2019
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