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USSD can be used for WAP browsing, prepaid callback service, mobile-money services, location-based content services, menu-based information services, and as part of configuring the phone on the network. [1] The service does not require a messaging app, and does not incur charges. [2] USSD messages are up to 182 alphanumeric characters long.
Closed User group (CUG) is a supplementary service provided by the mobile operators to mobile subscribers who can make and receive calls from any member associated within the group.
A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops).
So if your bank leaves a voicemail, don’t just call back the number from the missed call. Find the official number online and dial that, suggests Levin. “Never trust—always verify,” he says.
Rain (Pty) Ltd launched in February 2018, and began providing data only services using 3000 of their own cell towers and by leasing infrastructure from Vodacom and MTN. [4] [5] Clients who were interested on using the services create an online profile and the SIM card would be delivered by CCD Couriers.
Vodacom was ordered in 2016 by the country's top court to pay Nkosana Makate for his role in creating the company's call-back messaging service. The Constitutional Court did not set a specific ...
Other countries have sought to use technical means to prevent callback, by blocking the inbound and outbound calls made to and from DID numbers, or by disabling touch tone dialing. However, this is also overcome by the use of speed dial numbers, while others use these services by triggering callback via the Internet or SMS.
Some providers achieve this automatic call interception and callback by encoding a program onto the SIM card. Other providers use Multi-IMSI (International Mobile Subscriber Identity) technology to lower the cost of roaming. In this case, there is a program on the SIM card that selects the lowest cost IMSI (or 'profile') to use in a specific ...