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An eSIM (embedded SIM) is a form of SIM card that is embedded directly into a device as software installed onto a eUICC chip. First released in March 2016, eSIM is a global specification by the GSMA that enables remote SIM provisioning; end-users can change mobile network operators without the need to physically swap a SIM from the device.
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).
Credit card, debit card, [3] or online payment processors. Direct draw from bank account using an ATM [4] [5] [6] Retail store purchase with a "top-up" or "refill" card at retail. These cards are stamped with a unique code (often under a scratch-off panel) which must be entered into the phone in order to add the credit onto the balance.
The SIM card allows users to change phones by simply removing the SIM card from one mobile phone and inserting it into another mobile phone or broadband telephony device, provided that this is not prevented by a SIM lock. The first SIM card was made in 1991 by Munich smart card maker Giesecke & Devrient for the Finnish wireless network operator ...
For GSM, UMTS and LTE networks, this number was provisioned in the SIM card and for cdmaOne and CDMA2000 networks, in the phone directly or in the R-UIM card (the CDMA equivalent of the SIM card). Both cards have been superseded by the UICC. An IMSI is usually presented as a 15-digit number but can be shorter.
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It was cheaper to change the SIM card than pay high roaming charges. The number of inter-state travelers demanded unlocked phones. Usually, phones and SIM cards are sold separately. Mobile phone manufacturers sell phones directly to customers rather than through network operators.
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