The Motorola ES400S, available only from Sprint, is not a typical smartphone. It is designed for high-security environments such as certain military applications. It includes, for example, a finger-swipe biometric sensor.
The hardware and software are almost laughably out of date: It runs Microsoft Windows Mobile 6.5.3 Professional — you read that correctly, not Windows Phone, but Windows Mobile, the operating system that was dropped by Microsoft years ago. The CPU is a very old ARM processor running at half the speed of typical current versions. The 3-inch display has puny resolution.
The very fact that it's still on the market is an indication that it's still being bought, probably for applications for which no other phones meet requirements. But if you're one of the buyers of those phones you know this. For the rest of us, look at the ES400S and be amused, and then look on.