Pixel 4 could finally have true dual SIM support

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ESIM is only used by a few carriers around the world, including Sprint in the United States, but it can act as a second SIM alongside the hardware SIM when activated.

Thanks to new code uncovered in the latest version of Android and spotted by the team at XDA Developers, we now have a clue about another upgrade coming to the next Google Pixel - fully-fledged dual SIM support.

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The source of information by way a short post made on the official page of the Android Open Source Project (AOSP). "In general, some devices will be single SIM, even if they contain two SIM cards, as the Pixel 2018 case and that is a valid configuration".

This is news and it's not; the Pixel 3 line is technically dual-SIM, but the functionality is disabled in most markets. According to a source, the next-gen Pixel device will be coming with an improved dual SIM functionality. The most common is Dual SIM Dual Standby, wherein both SIMs are registered on the network at once, and both can receive calls / SMS, but generally only if the other SIM isn't already being used for that objective.

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Like those older dual SIM phones, the current Pixel use Dual SIM Single Standby or DSSS. So, the minute that you switch over to the eSIM, you're no longer able to make or receive phone calls from the number assigned to the physical SIM in your smartphone. This is how the Pixel 2 series and Pixel 3 series work, as both have a physical SIM slot and an eSIM slot. Most Android phones that support multiple SIM cards, as well as the iPhone XS and XS Max, use DSDS. You aren't required to purchase two identical phones to take advantage of the promotion, any combination of Pixel 3 or Pixel 3 XL phones will work regardless of their storage capacity.

While all that means Android Q will better detect dual SIM in devices, a comment on the commit suggests DSDS will come to the Google Pixel 4.

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Although Pixel 3 supports dual-SIM, it does not feature proper dual-SIM support.