Irregularity in my rendered image Close to a final result but not yet ... I have this irregularity in my rendered image (left bottom corner). 



I guess it is caused by a small irregularity in my mesh ?? 



Is this correct ? And how best to solve such issues ?
No, that is a red spot in the image you are using as environment (it seems a red "camera" led)... :) it is just reflected by your glossy phone model.