iPhone XS and XS Max Have 4GB of RAM, XR Has 3GB; XS Max and XR Have Larger 3,174 and 2,942 mAH Batteries - MacRumors
Apple Hub on X: "Full specs including battery capacity and RAM inside the new iPhones have surfaced in regulatory filings. The iPhone XS and XS Max both feature 4GB of RAM, XR
Apple IPhone XS 64GB HDD - 4 GB RAM -Silver @ Best Price Online | Jumia Kenya
Apple iPhone Xs - Full Specification, price, review
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Apple iPhone XS specs - PhoneArena
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iPhone XS specs vs. X, XR, XS Max: What's the same and different - CNET
The iPhone XS Max has the most RAM and largest battery capacity of any iPhone - SoyaCincau
Apple iPhone XS specs - PhoneArena
iPhone XS: Now Discontinued. Everything We Know.
Apple iPhone XS Max 512GB - McPhilips Digital
Apple iPhone XS, iPhone XC, iPad Pro (2018), Macbook (2018) and Apple Watch 4 specs-sheet leaked ahead of official launch
iPhone XR vs. iPhone XS vs. iPhone XS Max — Comparing the Key Specs « iOS & iPhone :: Gadget Hacks