Google plans to give the Pixel 4 this 2018 Apple iPhone feature

Google's Pixel 4 may offer improved dual-SIM functionality, according to an AOSP commit

Google Pixel 4 could come with improved dual-SIM support: Report

To that end, a new piece of information suggests that the Google's next Pixel smartphone will feature better dual SIM functionality, among other features. The AOSP Gerrit is an online collaboration tool where developers who can share code changes - called commits - and merge them into Android's source code. 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. Most Android phones that support multiple SIM cards, as well as the iPhone XS and XS Max, use DSDS.

The second, Dual SIM, Dual Standby (DSDS), allows a phone to receive calls and texts from the secondary SIM as long as the phone isn't actively using the primary SIM for the same goal. Also available in the latest iPhones and many dual SIM Android smartphones, this basically means that the other SIM can receive calls or texts so long as the primary SIM slot isn't actively being used for the same objective. This means that even though you can have two SIMs operating on two different networks, you will not be able to receive calls or texts to the inactive SIM slot. Ideally, phones would have Dual SIM Dual Active (DSDA) capabilities but those require two wireless radios instead of one. The Googler also points out that Dual SIM, Dual Standby is being tested internally on the Pixel 3 in preparation for use with the Pixel 4 models. Specifically, the comment cites the implementation as necessary to differentiate the 2018 and 2019 Pixel - in other words, the Pixel 3 and Pixel 4.

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Whether this means the Pixel 4 will support two hardware SIMs (as most users would understand dual SIM to mean) remains to be seen, but it appears if it does, the software will be ready for it.

In truth, the Pixel phones since the 2017 Pixel 2 actually have dual SIM support.

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