Dual SIM cell phones and simultaneous calls

Dual SIM cell phones and simultaneous calls – Take a look at these tips, tricks, and solution you can use to make your life much easier with your devices whenever problems arrive and complications which you may find difficult to deal with.

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1 Dual SIM Dual Standby (DSDS)

2 Dual SIM Dual Active (DSDA)

3 Dual Standby working as Dual Active

3.1 Related posts:

Currently, two types of Dual SIM cell phones (dual SIM or “Duos”) are marketed with Android: those that can be hooked up to a single call at a time and have to deactivate the second line or SIM for the duration of that call, and those that can handle two calls simultaneously and allow the user to choose the call:

Dual SIM Dual Standby (DSDS)

The two SIMs are on hold simultaneously, but when one of them connects to a call, the other is out of service (calls received on this are generally sent to voicemail). Physically there is only one transceiver in the mobile that is shared by both SIMs.

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Dual SIM Dual Active (DSDA)

dual sim cell phones dual active calls

The two SIMs are on simultaneous standby and if one of them connects to a call, the other can also connect to another call at that time. The user is notified of this new incoming call and can end or put the previous call on hold to answer the new one. Physically there are two transceivers in the device, one for each SIM (this can generate extra battery consumption). This technology can also be called Dual SIM Active or Dual Active.

Dual Standby working as Dual Active

cell phones dual sim calls divert

In a cell phone, you can configure the forwarding of incoming calls to another number, if it is not available. In the case of a dual SIM dual standby cell phone, when SIM 1 is on a call, SIM 2 will be out of service, as indicated. The trick consists of diverting that call that arrives at SIM 2 at that moment to SIM 1, becoming a call on hold in SIM 1 that the user can take:

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1. Open the phone application (“Dialer”) that is factory installed on the device.
2. Open the phone application settings (commonly via a menu button at the top right).
3. Tap on “Call Forwarding”.
4. Select the SIM 2.
5. Tap on “Forward if not available”.
6. Enter the phone number of SIM 1.
7. Save the changes.

In this case, SIM 2 was configured so that, when it is out of service, it redirects calls to SIM 1. You must perform the same configuration for SIM 1 (in step four select SIM 1 and in step six enter the phone number of SIM 2).

Unfortunately, this is a network option so this setting will only be accepted if the operator provides this call forwarding service. When not, you will likely see a message such as’ Failed to read data. Unexpected network response »when trying to save the settings mentioned above.

During navigation
This problem in Dual SIM Dual Stand By cell phones can not only occur during calls, but also during navigation: if you navigate on one SIM, it is possible that the other one is off-line and cannot receive calls either.

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There is another type of “Passive” Dual SIM device, which although they have two slots to house two chips, only one of them can be active at a time and it is possible to switch from one line to another using a switch. Although these devices exist, they are currently little commercialized.

More information: Wikipedia