Why do all USSD codes by South African Mobile Networks start with the number One?

WillPower TJ

Active Member
Joined
Jan 16, 2015
Messages
62
Why do all USSD codes by South African Mobile Networks start with the number One?

On Cell C we use:
*101# to view balances
*102# for a prepaid recharge
*147# for utilities menu
*111# for please call me's ……

On Vodacom :
*111# for utilities menu
*100# for balance enquires
*141*777# service setups
*140# please call me 's …

On Telkom Mobile :
*188# for balance enquires
*180# utilities menu
*140# for please call me's……

On virgin Mobile :
*100# utilities menu
*104# balance enquires ……

On MTN :
*141# for balance enquiries
*121# for please callMe's…

All these codes have the number ONE after the asterisk and some of the networks seem to share codes. Is it compulsory for all mobile networks to follow this convention when making their USSD codes? can an operator decide to use something else like *751# or *911# if they want?
 

eg2505

Honorary Master
Joined
Mar 12, 2008
Messages
16,047
Well spotted,
Must be international convention, but again just a guess.
 

Johnatan56

Honorary Master
Joined
Aug 23, 2013
Messages
25,138
Well googling stuff:

How cancel all diverts on your Cell C number
Dial USSD code ##002#

How to divert all calls with Cell C
Dial **21*08414 followed by the last 9 digits of your phone number# (e.g.**21*084148476543210#)

Divert calls when busy on your Cell C number
Dial USSD code **67*08414 followed by the last 9 digits of your phone number#

Divert Calls to voice mail with Cell C
Dial **62*08414 followed by the last 9 digits of your phone number #

Divert Calls to voicemail when there’s no answer
**61*08414 followed by the last 9 digits of your phone number #
http://sacellularnet.co.za/2013/09/list-cellc-ussd-codes/
Sure there are others for the other providers.
 
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