Apple iPhone Xs / Xs Max - Available Memory - AT&T
iPhone XS, XS Max, XR specs: Battery size, RAM details revealed in new filings | ZDNET
Apple iPhone XS Max - Full phone specifications
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 MAX 64GB – VipVendor
iPhone XR vs. iPhone XS vs. iPhone XS Max — Comparing the Key Specs « iOS & iPhone :: Gadget Hacks