If the call is received from a phone number they do not recognize, chances are they will not pick up. If they are not aware there is an emergency or critical event, they may not be able to answer the phone. Similarly, if the call goes to voicemail, they may not be in a situation where they have the time or privacy to open their voicemail and listen to the message. With fewer people sending and receiving voicemails, it is not surprising to find many voicemails are ignored altogether.
Email is another relatively modern technology that enables companies to send mass messages to employees or groups of employees. If your plan utilizes this mode of communication, it is assuming people have access to their email at all times, are checking their emails frequently, the message is not being marked as spam or junk, the message is not being buried by all of the other incoming emails, and the employee is taking the time to read through the entire message before deleting. It may surprise you to know that emails have only a 20 percent open rate and 62 percent of people check their email messages fewer than 10 times per day.
In times of emergency, phone calls and emails simply are not enough. There are too many variables in play as to whether the employees who need the messaging the most will actually receive the message. Fortunately, there are newer channels that are proving much more effective in reaching people in the most efficient and reliable ways possible.