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If the wrong PIN is entered more than three times, the SIM card will become locked. It can be unlocked by entering the PUK code provided by the mobile service provider, [1] which may be available on the SIM card's packaging, the contract, or provided by customer service after identity verification. After the PUK code is entered, the PIN must be ...
A mobile phone may be PIN protected. If enabled, the PIN (also called a passcode) for GSM mobile phones can be between four and eight digits [41] and is recorded in the SIM card. If such a PIN is entered incorrectly three times, the SIM card is blocked until a personal unblocking code (PUC or PUK), provided by the service operator, is entered. [42]
A SIM lock, simlock, network lock, carrier lock or (master) subsidy lock is a technical restriction built into GSM and CDMA [1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks.
USSD on a Sony Ericsson mobile phone (2005). Unstructured Supplementary Service Data (USSD), sometimes referred to as "quick codes" or "feature codes", is a communications protocol used by GSM cellular telephones to communicate with the mobile network operator's computers.
A typical SIM card (mini-SIM with micro-SIM cutout) A SIM (Subscriber Identity Module) card 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).
It is headquartered alongside Telkom in the Telkom Landmark Complex. Telkomsel is the largest cellular telecommunication carrier in the country with 169.5 million customer base as of 2020. [ 2 ] The company operates their GSM network on the 900–1800 MHz frequency range, as well as 3G , 4G , and 5G services on other frequencies.
Telkom (formerly known as 8.ta from 18 October 2010 till 19 March 2013 and as Telkom Mobile From 19 March 2013 till 2014), [1] [2] [3] is a South African mobile telecommunications company. Telkom was launched in October 2010 and is owned by Telkom SOC .
1994, February 23, Turkey met with GSM technology. GSM was put into service firstly for its subscribers in Ankara, Istanbul, and İzmir. [citation needed]1995, April 24, By separating the telecommunication and postal services in PTT from each other, Türk Telekomünikasyon A.Ş. was founded.