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After the PUK code is entered, the PIN must be reset. If the wrong PUK is entered ten times in a row, the SIM card will become permanently blocked and unrecoverable, requiring a replacement. Mobile phone users are therefore advised by most providers to keep their PUK written down in a safe place separate from the device.
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 Both cards have been superseded by the UICC.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.
On recent phone models running Android software, the phone will display a message saying "SIM network unlock PIN" or "Enter Network Lock Control Key" if network locked. Windows phones will display the message, "This SIM card can only be used on specific networks. Contact your customer service center for the unlock code".
A typical SIM card (mini-SIM with micro-SIM cutout) T-Mobile nano-SIM card with NFC capabilities in the SIM tray of an iPhone 6s cell phone 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 ...
Below are USB-C connector, speaker, microphone and depending on the version slot for 1 SIM card and microSD memory card up to 1 TB or hybrid slot for 2 SIM cards. The second microphone is located on top. On the right side are the volume buttons and the smartphone lock button.
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.
The rear cover can be exposed to access the battery compartment, as well as SIM and microSD card slots. [13] The device includes a removable 2500 mAh Li-On battery. [13] The Galaxy Note features a 5.3-inch HD Super AMOLED Wide XGA display, with a display resolution of 800 x 1280 (285 pixels per inch), as well as Mobile High-Definition Link (MHL).
A dual SIM tray as shown on a counterfeit Samsung Galaxy S7. Certain variants of the phone can accept either two nano SIMs or a nano SIM and a MicroSD card in place of the second SIM. Some telephones have a primary and a secondary SIM slot that support different generations of connectivity.
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