Home screen widgets that show how much data you've used/have remaining for the month, display live data usage by apps running, and your apps that use the most data; Awards you badges based on your data consumption, ranging from Absolute Beginner to Data Tamer Where It Excels. We've mentioned Onavo for Android before, and its iOS cousin.
There can be electrocardiogram (EKG, ECG) changes associated with low potassium, and sometimes the diagnosis of low potassium is made incidentally by finding the characteristic U waves on the EKG tracing. In severe cases, hypokalemia can lead to dangerous disturbances in heart rhythm (dysrhythmia).
Thus, hypokalemia is both a cause and a frequent consequence of metabolic alkalosis. Causes are listed; the most common are volume depletion (particularly when involving loss of gastric acid and chloride [Cl] due to recurrent vomiting or nasogastric suction) and diuretic use (see Table: Causes of Metabolic Alkalosis).