Sending bulk SMS messages to your customers is fast and economical. Most people have their phones all day, so SMS provides an excellent opportunity to read your message. One study found that nine out of 10 people opened text messages within three minutes of receiving them. Even if people just turn on the ringtone and turn off incoming message alerts, they can be quickly drawn by messages and special offers inside. In addition, messaging is known for its reliable delivery of sensitive and timely messages, making it your best bet to promote customer engagement.