What Does It Mean When the Code Ussd Is Being Read on Your Phone
Unstructured Supplementary Service Information (USSD), sometimes referred to every bit "quick codes" or "feature codes", is a communications protocol used past GSM cellular telephones to communicate with the mobile network operator's computers. USSD can exist used for WAP browsing, prepaid callback service, mobile-money services, location-based content services, menu-based information services, and equally role of configuring the phone on the network.[1]
USSD letters are up to 182 alphanumeric characters long. Unlike short message service (SMS) messages, USSD messages create a real-time connection during a USSD session. The connectedness remains open, allowing a two-style commutation of a sequence of data. This makes USSD more responsive than services that employ SMS.[1]
Uses [edit]
When a user sends a message to the phone company network, information technology is received past a computer dedicated to USSD. The computer's response is sent back to the phone, generally in a basic format that tin easily be seen on the telephone display. Letters sent over USSD are not divers by any standardization trunk, so each network operator tin can implement whatever is most suitable for its customers.
USSD can be used to provide contained calling services such every bit a callback service (to reduce phone charges while roaming), enhance mobile marketing capabilities or interactive data services.
USSD is commonly used by prepaid GSM cellular phones to query the available balance. The vendor's "check remainder" application hides the details of the USSD protocol from the user. On some pay as you go networks, such every bit Tesco Mobile, once a user performs an activeness that costs money, the user sees a USSD bulletin with his or her new remainder. USSD can also be used to refill the balance on the user's SIM card and to deliver 1-time passwords or Pin codes.
Some operators utilise USSD to provide access to existent-fourth dimension updates from social-networking websites like Facebook and Twitter.[ii] Wikipedia uses USSD to ship articles to some feature phones.[3]
USSD is sometimes used in conjunction with SMS. The user sends a asking to the network via USSD, and the network replies with an acknowledgement of receipt:
- "Give thanks you, your bulletin is being processed. A message will be sent to your phone."
Subsequently, one or more mobile terminated SMS messages communicate the status and/or results of the initial request.[iv] In such cases, SMS is used to "push button" a respond or updates to the handset when the network is gear up to send them.[v] In contrast, USSD is used for command-and-command merely.
Technical details [edit]
Near GSM phones accept USSD capability.[6] USSD is by and large associated with real-time or instant messaging services. There is no store-and-forward capability, as is typical of other brusk-message protocols like SMS. In other words, an SMSC is non present in the processing path.
USSD Phase 1, equally specified in GSM 02.xc, only supports mobile-initiated ("pull") operations.[vii] In the core network, the bulletin is delivered over MAP, USSD Phase 2, equally specified in GSM 03.90.[8] Afterward entering a USSD lawmaking on a GSM handset, the reply from the GSM operator is displayed inside a few seconds.
Format [edit]
A typical USSD message starts with an asterisk (*) followed by digits that incorporate commands or information. Groups of digits may be separated by boosted asterisks. The message is terminated with a hash symbol (#).[1]
USSD manner [edit]
Mobile-initiated
- USSD/ PULL or USSD/ P2A
- when the user dials a code, e.thousand. *139# from a GSM mobile handset
Network-initiated
- USSD/ PUSH or USSD/A2P
- when the user receives a push bulletin from the network; primarily used for promotional services
| Example USSD codes |
|---|
| *101# |
| *139*1*1234567890# |
Code tabular array [edit]
The codes below are non USSD codes, but rather MMI Supplementary Service codes; they are standardized then they are the same on every GSM telephone. They are interpreted by the handset first before a corresponding command (not the code itself) is sent to the network. These codes might non always piece of work when using an AT interface; there are standard AT commands divers for each of these actions instead.[nine] [10]
BS is the type of bearer service, some valid values are:
- 11 for vocalisation
- 13 for fax
- 16 for SMS (only valid for barring)
- 25 for information
- <get out blank> for all.
T is number of seconds for the No Respond Condition Timer, default is 20 seconds if non specified.
| Code | Function | Note | Switch on | Switch off | Display condition |
|---|---|---|---|---|---|
| 002 | all diversions | unconditional, busy, unreachable, does not respond | * * 002 * number * BS * T # | # # 002 * * BS # | * # 002 * * BS # |
| 004 | all conditional redirections | busy, unreachable, does not answer | * * 004 * number * BS * T # | # # 004 * * BS # | * # 004 * * BS # |
| 03 | Change Network password | countersign is network dependent, default on some networks is 0000. See phone call barring functions *33 | * * 03 * 330 * old password * new password * new password # | ||
| 04 | Change PIN | * * 04 * sometime PIN * new Pin * new Pivot # | |||
| 042 | Change PIN2 | Simply with Phase 2 SIM | * * 042 * onetime PIN2 * new PIN2 * new PIN2 # | ||
| 05 | Change PIN by PUK | * * 05 * PUK * new Pin * new Pin # | |||
| 052 | Change PIN2 via PUK | But with Phase 2 SIM | * * 052 * PUK * new PIN2 * new PIN2 # | ||
| 06 | read device number (IMEI) | * # 06 # | |||
| 21 | unconditional divert | all incoming calls will be diverted | * * 21 * number * BS # | # # 21 * * BS # | * # 21 * * BS # |
| 30 | get the caller'due south number displayed (Clip) | as a callee get the Clip displayed | * xxx # | # 30 # | * # 30 # |
| 31 | suppressing the transmission of caller's phone number (CLIR) | for all subsequent calls | # 31 # | * 31 # | * # 31 # |
| 31 | temporary change of the transmission of CLIR | valid just for the next phone call; no final # | # 31 # number | * 31 # number | |
| 330 | total incoming and outgoing service barring | countersign is network dependent, default on some networks is 0000 | * 330 * password * BS # | # 330 * password * BS # | * # 330 * * BS # |
| 33 | outgoing telephone call barring | countersign is network dependent, default on some networks is 0000 | * 33 * password * BS # | # 33 * countersign * BS # | * # 33 * * BS # |
| 331 | outgoing international call barring | password is network dependent, default on some networks is 0000 | * 331 * password * BS # | # 331 * password * BS # | * # 331 * * BS # |
| 332 | outgoing international call barring, excluding to home | password is network dependent, default on some networks is 0000 | * 332 * password * BS # | # 332 * password * BS # | * # 332 * * BS # |
| 333 | total approachable service barring | password is network dependent, default on some networks is 0000 | * 333 * countersign * BS # | # 333 * password * BS # | * # 333 * * BS # |
| 35 | incoming phone call barring | password is network dependent, default on some networks is 0000. Incompatible with call diversion | * 35 * password * BS # | # 35 * password * BS # | * # 35 * * BS # |
| 351 | incoming call barring, when international roaming | password is network dependent, default on some networks is 0000 | * 351 * password * BS # | # 351 * password * BS # | * # 351 * * BS # |
| 353 | total incoming service barring | password is network dependent, default on some networks is 0000 | * 353 * password * BS # | # 353 * password * BS # | * # 353 * * BS # |
| 37 | Recollect on busy (CCBS) | valid on some mobile networks only | * 37 # | # 37 # | * # 37 # |
| 43 | incoming call notification when decorated | aka telephone call waiting | * 43 * BS # | # 43 * BS # | * # 43 * * BS # |
| 61 | call divert when non answered | * * 61 * number * BS * T # | # # 61 * * BS # | * # 61 * * BS # | |
| 62 | call divert when off or not reachable | * * 62 * number * BS # | # # 62 * * BS # | * # 62 * * BS # | |
| 67 | call divert when decorated or pressing refuse | * * 67 * number * BS # | # # 67 * * BS # | * # 67 * * BS # | |
| Code | Function | Annotation | Switch on | Switch off | Brandish status |
See also [edit]
- USSD Gateway
- Ultra Mobile Broadband
- Supplementary service codes
- Call forwarding § Mobile (jail cell) phones
- SIM Application Toolkit
References [edit]
- ^ a b c "Unstructured Supplementary Services Data (USSD)". Telecom Space . Retrieved August 23, 2010.
- ^ "TATA Docomo introduces Facebook, Twitter access via USSD". 16 July 2011. Retrieved 12 Nov 2019.
- ^ Wadhwa, Kul (22 Feb 2013). "Getting Wikipedia to the people who demand information technology most". Wikimedia blog. Wikimedia Foundation. Retrieved 10 May 2013.
- ^ "Monitor usage on your phone". AT&T Residential Wireless Back up. Archived from the original on 11 May 2012. Retrieved xiv May 2012.
- ^ "Manage your business relationship". AT&T Residential Wireless Support. AT&T. Retrieved xi May 2013.
- ^ "Windows Telephone 7 doesn't support USSD". Microsoft Answers. Microsoft. 8 February 2012. Retrieved xi May 2013.
- ^ "GSM 02.90 (ETSI TS 100 625, V7.0.0) Specification (USSD) – Stage 1". 3gpp.org. 3rd Generation Partnership Projection. Retrieved xi May 2013.
- ^ "GSM 03.xc (ETSI TS 100 549, V7.0.0) Specification (USSD) – Stage ii". 3gpp.org. 3rd Generation Partnership Project. Retrieved eleven May 2013.
- ^ http://www.etsi.org/deliver/etsi_ts/122000_122099/122030/10.00.00_60/ts_122030v100000p.pdf
- ^ "What'due south the difference between USSD, MMI and SS codes?".
External links [edit]
- GSM 04.90 (ETSI EN 300 957, V7.0.1) Specification (USSD) Stage 3 – 3GPP
- 3GPP TS 22.030
- What's the difference between USSD, MMI and SS codes?
Source: https://en.wikipedia.org/wiki/Unstructured_Supplementary_Service_Data#:~:text=Unstructured%20Supplementary%20Service%20Data%20(USSD,mobile%20network%20operator's%20computers.
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