Please allocate time to phone them though you are busy with your activities
As you grow up, almost the entire activity filled with personal issues. Either preoccupied with campus activities or work, slowly the time for both parents you start to diminish.
Often we are engrossed with their own affairs but at home there is your father or mother who worried waiting for you back home. Therefore, please allocate time to give them the news even if only briefly, at least they know that you are fine.