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In their marketing materials, Samsung uses the term "Dual SIM Always On” [3] to describe the Duos phones, although both SIM cards are not always on. All phones with this feature are regular, Dual SIM Stand-by (DSS) phones, with 1 transceiver (radio). The second SIM is always disconnected when a call is in progress on SIM 1 and vice versa.
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 ...
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.
Call waiting is a telephone service where a subscriber can accept a second incoming telephone call by placing an in-progress call on hold—and may also switch between calls. With some providers it can be combined with additional features such as conferencing, call forwarding, and caller ID. Call waiting is intended to alleviate the need to ...
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.
Call forwarding, or call diversion, is a telephony feature of all telephone switching systems which redirects a telephone call to another destination, which may be, for example, a mobile or another telephone number where the desired called party is available. Call forwarding was invented by Ernest J. Bonanno.
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The Samsung GT-I7500 Galaxy is a smartphone manufactured by Samsung that uses the open source Android operating system.It was announced on 27 April 2009 [2] and was released on 29 June 2009 as the first Samsung Mobile device to use the Android operating system introduced in the HTC Dream (marketed as the T-Mobile G1), [3] and the first in what would become the long-running Galaxy series.