The

Samsung Galaxy Samsung Galaxy (, stylised as SΛMSUNG Galaxy since 2015 (except Japan where it omits the Samsung branding), previously stylised as Samsung GALAXY; abbreviated as SG) is a series of computing and mobile computing devices that are designed, ...

(stylized as Samsung GALAXY) is a series of Android-powered mobile computing devices designed, manufactured, and marketed by

Samsung Electronics Samsung Electronics Co., Ltd. (, sometimes shortened to SEC and stylized as SΛMSUNG) is a South Korean multinational corporation, multinational electronics corporation headquartered in Yeongtong-gu, Suwon, South Korea. It is the pinnacle of ...

; including

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 either allows users to switch between two separate mobile network services manually, has hardware support for keeping ...

SmartPhones A smartphone is a portable computer device that combines mobile telephone and computing functions into one unit. They are distinguished from feature phones by their stronger hardware capabilities and extensive mobile operating systems, which ...

marketed as Duos.

Range

The Samsung Galaxy offers several different ranges of devices, including Smartphones,

Phablet A phablet (, ) is a mobile device combining or straddling the size formats of smartphones and tablets. The word is a portmanteau of ''phone'' and ''tablet''. Phablets feature large displays that complement screen-intensive activity such as mo ...

s, 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 categorized in the following way:Samsungs Smartphone-Klassifizierung
/ref> Phone unlock itself now 19:50 *GT-x5nnn - Budget ("Realistic ") devices *GT-x7nnn - Mid-range ("Slim") devices *GT-x8nnn - Upper mid-range ("Loyal") devices *GT-x9nnn - High end ("Clever ") devices where x = I, N or S and nnn = model number Within the Smartphone ranges, Samsung often produces a Dual SIM variant, but these on 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. The model number of Samsung Smartphones will indicate the variant *GT-xnnn0 - mainstream model *GT-xnnn2 - Dual SIM "Duos" model *GT-xnnn5 - 3G/LTE model

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

/ Grand Quattro *GT-I8262 - Galaxy Core Duos *SM-G530H -

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

*SM-G355H - Galaxy Core 2 *SM-J110H -

Galaxy J1 Ace Duos A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek ' (), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. ...

*SM-J500H/DS -

Samsung Duos The Samsung Group (or simply Samsung) ( ko, 삼성 ) is a South Korean multinational manufacturing conglomerate headquartered in Samsung Town, Seoul, South Korea. It comprises numerous affiliated businesses, most of them united under the ' ...

*SM-A730F/DS -

Galaxy A8+ Duos A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek ' (), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. ...

Samsung "Dual SIM Always on" feature

In their marketing materials, Samsung uses the term "Dual SIM Always on” to describe the Duos phones, although technically the term is misleading since it does not mean quite what it says – both SIM cards are not always on. All phones with this feature are regular Dual SIM Stand-by (DSS) phones with 1 transceiver (radio) – 2nd 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.” These Android phones have a menu option “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 is ...

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 behavior, 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. The menu option “Dual SIM Always on” might be better named “Dual SIM when busy”.

References

Samsung mobile phones Samsung Galaxy {{Samsung-mobile-stub