SMS marketing is a method used by many companies to reach their client base instantaneously with promotional or informational text messages. While it doesn't have the high adoption rate among brands that email marketing enjoys, SMS is an effective and in-demand marketing tactic. Estimates indicate that 48.7 million consumers will opt in to receive SMS messages from businesses by the end of 2020, so there is certainly consumer appetite for this method of brand communications. And with an average open rate of 98 percent, compared to a 20 percent average for email marketing, SMS might just be one of the most underrated marketing tactics around.