Conclusion: The Motorola ES400S is for businesses with Sprint contracts, and it succeeds as a proper enterprise tool that works worldwide with legacy Windows Mobile apps. Just make sure you get the extended battery.
Pros: True world phone. Robust enterprise app support and management tools. Tough, rugged design. Loud speakerphone and push-to-talk capability.
Cons: Bulky. Sluggish. Ancient Windows Mobile OS. Background hiss during calls. Short battery life.
Summary: The Motorola ES400S is definitely too big and clunky for an average consumer, but mobile task workers might find this a very useful tool for the job.
Pros: The Motorola ES400S is a business-centric phone with a rugged exterior, a biometric fingerprint sensor, a 3.2-megapixel camera, a bar code scanner function, and plenty of enterprise-level applications.
Cons: The Motorola ES400S still runs on Windows Mobile 6.5.3 and its resistive touch screen sometimes requires a stylus for more precision.