rugged (or ruggedized, but also ruggediseddevice is a phone specifically designed to operate reliably in harsh usage environments and conditions, such as strong vibrations, extreme temperatures and wet or dusty conditions. They are designed from inception for the type of rough use typified by these conditions, not just in the external housing but in the internal components and cooling arrangements as well. In general, ruggedized and hardened phone share the same design robustness and frequently these terms are interchangeable.

Typical environments for rugged phones, tablet PCs and PDAs are public safety, field sales, field service, manufacturing, retail, healthcare, transportation/distribution[and the military. They are used in the agricultural industries, and by individuals for outdoor recreation activities.