It's important to know that this A1901 iPhone X model supports FDD-LTE bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 29, 30, and 66, plus TD-LTE bands 34, 38, 39, 40, and 41. It is designed for AT&T and T-Mobile in the US (lacking CDMA support for Verizon/Sprint) but officially supports carriers in Canada, the UK, the EU, and most other countries, excluding Australia, New Zealand, China, Hong Kong, Japan, and India.
All iPhone X models feature a 3D-touch capable 5.8-inch OLED HDR "Super Retina" display (2436x1125, 458 ppi) covering nearly the entire front, with the "Home" button replaced by a "Face ID" facial recognition system. It has three cameras: a front "TrueDepth" camera in the "notch" for Face ID, 7MP photos, and 1080p video with Portrait mode support, and dual rear 12MP cameras (wide-angle f/1.8 and telephoto f/2.4) with OIS, shooting 4K photos and video with AR capabilities.
The iPhone X has a "surgical-grade stainless steel" case with a glass front and back, is IP67-rated for splash, water, and dust resistance (not waterproof), and includes stereo speakers and a Lightning port. It was offered in "Space Gray" and silver.
Internally, it is powered by a 64-bit, six-core "Apple A11 Bionic" processor, has 3 GB of RAM, and 64 GB or 256 GB of storage. It supports 802.11ac Wi-Fi with MIMO, Bluetooth 5.0, LTE (4G), and NFC for Apple Pay. The glass back allows for Qi-standard wireless charging.
Apple estimates up to 60 hours of audio, 21 hours of talk time, 12 hours of internet use, and 13 hours of wireless video playback. In the US, it was initially sold unlocked and contract-free for US$999 or US$1149, with various carrier installment and upgrade plans also available.