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In North America, the NANP uses the *70 star code prefix to suspend call waiting for a dialed call. A stutter dial tone confirms the de-activation. On most European telephone networks, and GSM or UMTS mobile phones, call waiting is activated by dialing the following codes: To activate: *43# To deactivate: #43# To check status: *#43#
Depending on the carrier which the phone is locked to, only some codes will work with the mobile phone. Most phones respond to the unlock codes ending in +1# or +7#, however some phones are configured to allow only one of the seven codes to work. The following is an example of a DCT4/DCT3 unlock code: # pw+931882753035021+7#
Advanced Mobile Location (AML) is a free-of-charge emergency location-based service (LBS) available on smartphones that, when a caller dials the local (in country) short dial emergency telephone number, sends the best available geolocation of the caller to a dedicated end-point, usually a Public Safety Answering Point, making the location of the caller available to emergency call takers in ...
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).
Dual SIM standby phones allow both SIMs to be accessed by using time multiplexing. When one SIM is in active use, for example on a call, the modem locks to it, leaving the other SIM unavailable. Older examples of dual-SIM standby phones include the Samsung Galaxy S Duos, [23] the Sony Xperia M2 Dual, [24] and the iPhone XS, XS Max and iPhone XR ...
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Updating Android software is done over GSM where the SIM Toolkit may install automatically with new software regardless of automatic install applications. Change in applications and menus stored on the SIM is difficult after the customer takes delivery of the SIM and sometimes may be recognized as surveillance software.
in a QR code scanned by the user; by manually entering the SM's host name/Activation code on screen; hard coded by the host device manufacturer in firmware. via a universal discovery service operated by the GSMA. The LPA is responsible for validating the X.509 certificate of the SM is valid and issued by the GSMA certificate authority. [12]