I admit, I haven’t always done this—it wasn’t until after my 2nd year of teaching that I realized how important positive parent/teacher contact is. You want to establish good rapport with parents and really work as a team.
If, for whatever reason, you can’t call a parent, email works too; it’s just not as personal. This year, I’ve seen most of my parents face-to-face so I’ve been able to speak with them personally. If you make positive contact with parents within the first week of school, it usually makes the year run much smoother.