A great question submitted by Mark on the GGFaq website this week. There are many reasons for contacting members; we’re going to focus on absent members for this answer.
Considering all absent member communication methods, a phone call is nearly always the most effective, as you are having a meaningful interaction with the member. But phone calls are time consuming, and it’s often difficult to get through. If you encounter voicemail, we always recommend leaving a message, as it shows you’ve made the effort.