Do you know that simple phone call can make them happy. Parents they didn't leave you when you were young. So, don't leave them when they are are old.
Respect and love your parents as long as you have them. You may get everything in life but once they are gone you can't have them back ever.
Always be aware that every moment you are spending money, you are not exchanging commodities but you are spending the time, the energy, and respect that your parents earned by working hard.