Why did he said so?Doesn't he like phone calls which is more accurate to get news.
But May Its so bcuz ultimately this would lead to reveal the Vidit-Rishi connection to Indira.May someday she gets Rishi's phone and she reads these SMS etc.Than she inquire more Rishi to reveal the truth.Thats afcouse a thought Since on HD we never know what CV's are actully up to unless and untill it comes on screen.But Could it be possible ?