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USSD is commonly used by prepaid GSM cellular phones to query the available balance. The vendor's "check balance" application hides the details of the USSD protocol from the user. On some pay as you go networks, such as Tesco Mobile, once a user performs an action that costs money, the user sees a USSD message with their new balance.
Remote SIM provisioning is a specification realized by GSMA that allows consumers to remotely activate the subscriber identity module (SIM) embedded in a portable device such as a smart phone, smart watch, fitness band or tablet computer.
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.
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).
The first Prepaid card was called "Mimo" and was launched by TMN, the mobile phone operator of Portugal Telecom, in September 1995. [6] In 2006 Swisscom celebrated ten years with its product and service "NATEL® easy" which also holds a patent on "Prepaid mobile subscriber identification card and method implemented thereby". [7] [8]
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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 ...
Prepaid phone subscribers can top up their airtime balances via electronic reloading stations. These stations or retailers use a Retailer SIM card to top up prepaid credits on a subscriber's mobile phone. This SIM card functions similarly to commercially available prepaid SIM cards but with additional reloading/top-up functionality.