Samsung Galaxy Samsung Galaxy (; stylized as SΛMSUNG Galaxy since 2015 (except Japan where it omitted the Samsung branding up until 2023), previously stylized as Samsung GALAXY; abbreviated as SG) is a series of computing, Android mobile computing and wear ...

Duos (stylised as SAMSUNG GALAXY DUOS) are a series of Android

dual SIM Some mobile phones support use of two SIM cards, described as dual SIM operation. When a second SIM card is installed, the phone may allow users to switch between two separate mobile network services manually, have hardware support for keeping bo ...

mobile devices designed, manufactured, and marketed by

Samsung Electronics Samsung Electronics Co., Ltd. (SEC; stylized as SΛMSUNG; ) is a South Korean multinational major appliance and consumer electronics corporation founded on 13 January 1969 and headquartered in Yeongtong District, Suwon, South Korea. It is curr ...

as Duos.

Range

The Samsung Galaxy offers several different ranges of devices, including

Smartphones A smartphone is a mobile phone with advanced computing capabilities. It typically has a touchscreen interface, allowing users to access a wide range of applications and services, such as web browsing, email, and social media, as well as mult ...

Phablet A phablet (, ) is a mobile device combining or straddling the size formats of smartphones and tablets. The word is a blend word of ''phone'' and ''tablet''. The term was largely unused by the late 2010s, since average phone sizes eventually morph ...

s, and Tablets. Although widely known by marketing names, the underlying model ranges are best understood by looking at the model number. Since August 2011, all the smartphones of the Galaxy series are categorised in the following way (where x = I, N or S and nnn = model number):Samsungs Smartphone-Klassifizierung
*GT-x5nnn – Budget ("Realistic ") devices *GT-x7nnn – Mid-range ("Slim") devices *GT-x8nnn – Upper mid-range ("Loyal") devices *GT-x9nnn – High end ("Clever ") devices *GT-xnnn0 – mainstream model *GT-xnnn2 – Dual SIM "Duos" model *GT-xnnn5 – 3G/LTE model Within the Smartphone ranges, Samsung often produces a Dual SIM variant, but these are not often widely available in many markets, where retail dominance by Mobile Network Operators (MNO) who operate a SIM-locked business model naturally deprecates Dual SIM devices.

Duos Models

The following phones are available as Duos models *GT-S6802 – GALAXY Ace DUOS *GT-S7562 – Galaxy S Duos (Dual SIM version of Galaxy Ace IIx / Galaxy Trend) *GT-I9082 – Galaxy Grand Duos *GT-I9192 – Galaxy S4 Mini Duos *GT-I8552 – Galaxy Win/Grand Quattro *GT-I8262 – Galaxy Core Duos *SM-G530H –

Galaxy Grand Prime A galaxy is a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity. The word is derived from the Ancient Greek, Greek ' (), literally 'milky', a reference to the Milky Way galaxy that contains ...

*SM-G355H – Galaxy Core 2 *SM-J110H – Galaxy J1 Ace Duos *SM-J500H/DS – Samsung Duos *SM-J530F/DS – Samsung Galaxy J5 (2017) *SM-A730F/DS – Galaxy A8+ Duos

Samsung "Dual SIM Always on" feature

In their marketing materials, Samsung uses the term "Dual SIM Always On” 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 In radio communication, a transceiver is an electronic device which is a combination of a radio ''trans''mitter and a re''ceiver'', hence the name. It can both transmit and receive radio waves using an antenna, for communication purposes. The ...

(radio). The second SIM is always disconnected when a call is in progress on SIM 1 and vice versa. The manual for such phone's states: “Your device supports dual standby with two different networks. You cannot make or answer calls on both networks at the same time.” Samsung Galaxy Duos have a menu option entitled “Dual SIM Always On” which when activated, activates

call forwarding 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 i ...

on the carrier's network. This can be done manually on any phone, regardless of manufacturer, e.g., enable call forwarding to SIM 2 when SIM 1 is connected. Call Forwarding must be provided by the carrier, often for a fee, subscriber will also be charged for call forwarding on a minute-by-minute basis, this depends on the subscription agreement. “Dual SIM Always On” might sound like it is enabling the dual SIM capability of the phone. However, that control is elsewhere. Each SIM card in a Samsung dual SIM phone can be set to on or off independently in the top section of the SIM card Manager menu. When both are set to ON, then both can connect incoming calls, but only one at a time. If SIM 2 is in use, a caller to SIM 2 will be redirected by the carrier network as though the phone were off or out of range. E.g., to voicemail. This is the default behaviour, and it is what happens if “Dual SIM Always On” is set to "Offline". Setting “Dual SIM Always On” allows a call on one SIM to interrupt a call on the other SIM.

References

Galaxy Duos Duos {{Samsung-mobile-stub