Available for free with port-in and new plan at retailers like Metro by T-Mobile.
The iPhone X is limited to iOS 16 ; it does not support iOS 17, 18, or the current iOS 26. Legitimate 2026 BOGO & Free iPhone Offers
You can only find the iPhone X through third-party refurbished and used markets.
If you still wish to purchase an iPhone X as a backup or secondary device, use these verified refurbished platforms: Apple iPhone X 10 64GB iOS Factory Unlocked Grey ... - eBay