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On a touch tone telephone, the codes are usually initiated with the star key, resulting in the commonly used name star codes. On rotary dial telephones, the star is replaced by dialing 11 . In North American telephony , VSCs were developed by the American Telephone and Telegraph Company (AT&T) as Custom Local Area Signaling Services ( CLASS or ...
For example, suppose that a mobile phone user signs up for a post-paid cell phone plan that costs $40 per month and is allowed a quota of 700 minutes under that plan. If this user were to end up using 750 minutes in a month, then they would be charged an overage fee for the extra 50 minutes.
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.
Call forwarding, or call diversion, is a telephony feature of all telephone switching systems which redirects a telephone call to another destination, which may be, for example, a mobile or another telephone number where the desired called party is available. Call forwarding was invented by Ernest J. Bonanno.
This list contains the mobile country codes and mobile network codes for networks with country codes between 500 and 599, inclusively – a region that covers Oceania, Maritime South East Asia, and Thailand. Guam and the Northern Mariana Islands as parts of the United States are listed under Mobile Network Codes in ITU region 3xx (North America).
Call forwarding. Barring of Outgoing Calls. Barring of Incoming Calls. Advice of Charge (AoC). This GSM service estimates the call cost for display on the user's mobile phone. [1] This helps users by preventing bill shock [2] and reduces the load on the mobile network operator's customer service department. However, in practice, this GSM ...
Mobile phones use geographic area codes. Exchanges may service on mobile devices; local numbers are portable between wired and wireless carriers. While area code 600 has been established as a non-geographic code that can be used by mobile phones, the only significant mobile usage has been for satellite phone service in remote regions. Cape ...
A call to an 1800 is free when dialled from a landline, and mobile phones since 2014. [16] It depends on the individual mobile plan as how 13 and 1300 numbers are charged: all plans no longer charge for 1800 but 13 and 1300 may still be charged at a high rate, or outside included calls. These numbers "forward" to a geographic or mobile number.