Glass repair
Is the back glass on an iPhone X covered under FACTORY WARRANTY?
iPhone XS
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Yes, but only if it a manufacturing problem, not an accident. Screen damage if determined by Apple to be accidental is not covered by the regular warranty. If you have Applecare Plus you get two accidental damages/incidents for the life of the warranty at reduced cost.
iPhone Repair - Screen Damage [and links to other iPhone repair services] - https://support.apple.com/iphone/repair/screen-damage - includes pricing (note, third party AASP may set their own prices).