Unlike most iPhones, Apple discontinued the iPhone X after a year, in late 2018. Not because it’s bad. No, because it’s too good. Keeping the X on sale would have hurt sales of the XS and XR. The X has a slightly slower processor than the new models, but everything else is top of the line. If you can find it for $700 or less (refurbished or not), it’s worth a look. Currently, it’s $900. At that price, you should just buy an XR. AT&T, T-Mobile, Sprint, and Verizon still sell it. Hopefully the price will drop.