Every few weeks, my wife receives text messages from her hairdresser reminding her about appointments or checking if she would like to book an appointment via a special offer. This started a number of years ago and has become a welcome part of her life. This approach has now been adopted by a number of other local businesses we use. We now receive alerts about offers, sales, Christmas opening times and other activities. For us, it's a useful addition that we find far less intrusive than a phone call and more likely to be read than an email.