It doesn't have two main cameras nor does use the full extent of dual SIM capabilities. 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 goal.
According to recent commits to AOSP's Gerrit, the Pixel 4 will have dual-SIM functionality. One of those might be changing in the upcoming Pixel 4 phone later this year and, no, it won't be the cameras.
Put simply, you can't use your standard SIM and your eSIM at the same time in current Pixel phones, and that might be changing in the Pixel 4.
This is news and it's not; the Pixel 3 line is technically dual-SIM, but the functionality is disabled in most markets. Most Android smartphones come with Dual-SIM, Dual Active (DSDA) support, meaning users would be manually able to choose which SIM to be used for calls and data.More news: Stormi Webster gifted a Chanel handbag for her first birthday
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We're nearly certainly going to get Android Q arriving with the Pixel 4, ready to take advantage of that dual-SIM functionality. While you can have the settings on the eSIM and an installed SIM card from two different carriers, the one that is inactive cannot receive calls or texts.
The report further reveals that Google is defining support for "dual-SIM mode" with Android Q. The new system property value is meant to "differentiate devices that support enablement of dual-SIM mode from those that don't, even if they have two or more SIM cards". The second phone is expected to launch as the Pixel 3 XL Lite. 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 goal.
Although Pixel 3 supports dual-SIM, it does not feature proper dual-SIM support.