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ETSI and 3rd Generation Partnership Project (3GPP) standards, such as GSM and LTE, define supplementary service codes that make it possible to query and set certain service parameters (e.g., call forwarding) directly from mobile devices.
The main alternative is an answering machine or voicemail, but some callers do not wish to leave a recorded message, but want to have a two-way conversation. Some businesses have their calls forwarded to a call center , so that the client can reach an operator instead of an answering machine or voice mail.
example 971 530 000 000 with country code is 12 digits 54: Etisalat: example 971 540 000 000 with country code is 12 digits 55: Du: example 971 550 000 000 with country code is 12 digits 56: Etisalat: example 971 560 000 000 with country code is 12 digits 58: Du: example 971 580 000 000 with country code is 12 digits United Kingdom [16] +44 ...
The user submits a code corresponding to the service available. USSD can be used to provide independent calling services such as 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.
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Dynamic Tariffing (also known as Dynamic Discounting or Dynamic Discount Solution) [1] [2] is the technology used by MTN Group, [1] the Africa and Middle East telecoms provider, [2] [3] to operate MTN Zone, a prepaid-per-second billing price plan that offers potential discounts of up to 95 per cent on mobile phone calls for MTN prepaid subscribers making on-network calls.
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