Student or Learner
1) I miss my parents so much, but i can't call them now because my phone is broken. It will only increases my level of missing them since i can't call them.
ps:Increase level of missing somebody. Is that a correct way of saying make you miss somebody even more. I mean a more formal way of saying it.
It does not sound at all natural to me. My initial suggestion would be:
It will only add to how much I miss them.
But I am sure somebody else can come up with something better than my suggestion,