Players are expected to be there for sessions. There are reasonable excuses for not showing up at the time and place designated. Examples of such are:
Personal medical emergency
Natural hazardous conditions (Ice, Snow, Tornadoes, Monsoons)
Everyone will like you much more, if you do not bring your distractions to the campaign. Laptops are closed, and significant others/brothers/sisters/family are going to be asked to be elsewhere.