What is USSD (Unstructured Supplementary Service Data)?

What to know about this communications technology

Unstructured Supplementary Service Data (USSD) is acommunication protocolfor mobile phones.

By using USSD codes, it’s possible for you to access web-based services without installing a mobileapp.

Here’s what is it, how it works, and why it’s important.

What Is USSD?

The USSD messaging protocol is part of theGlobal System for Mobile Communications (GSM)digital cellular standard.

LikeSMSandMMS, USSD facilitates communication without the need for a dedicated app.

USSD relies on codes made up of characters found on every mobile phone.

It’s also possible to get social media updates fromFacebookandX (formerly Twitter)via USSD.

To initiate a USSD request, enter the USSD code on your keypad.

Some codes will run immediately while some require you to tapSend.

Also called quick codes or feature codes, these USSD codes are programmed into the rig’sSIM card.

Some feature codes only serve one purpose.

For example, dialing*#06#on mostAndroidphones will display yourIMEInumber.

OniPhones, dialing*3001#12345#*with display information about your unit and SIM card.

Other codes are specific to your mobile carrier.

USSD codes allow companies to provide web-based services to users.

USSD is often used in conjunction with SMS and MSS.