A phone number only messaging experience is provided in an Inter-Carrier Short Messaging System service. Each test design document can be associated to each test case to highlight which logs and traces need to be collected during its execution. The lightly doped regions in the other pair also have mutually different carrier concentrations and are located between the other heavily doped region and another one of the channel regions that is closer to the heavily doped region than any other channel region is. The analog signals are generated based on an amount of photo-charges accumulated in the storage node.