Ultrasound is very sensitive at picking up free fluid in the peritoneal space. Depending on the patient, free fluid may be an important finding in diagnosing abdominal disease. The character and the amount of fluid are important indicators for the composition and cause of the effusion.
I've had quite a few mishaps with my cell phone. I wasn't worried this last time, though, because I'd opted for the "backup assistant" service provided by my wireless carrier. At least my contact list would be safe—so I thought.