How to maintain old customers by SMS?

It is a process of establishing and consolidating interpersonal relationships by sending short messages, returning visits, feedback, tracking and contacting old customers. Customers have come to the company before and have got to know our company initially, and the follow-up is the process of constantly following up the development of interpersonal relationships. 1. Treat customers as friends and call/text them regularly to express condolences. It doesn't take long. Just ask words such as: Are you busy recently, take care of your health, and so on. You don't need to call every time, just ask if you need training recently, have you received our schedule, and so on. Always asking customers like this feels like selling. Generally, the HR manager of a company receives many such sales calls every day, and he is tired of answering them. At this time, what he wants is your greetings, and he can talk to him about his work and life properly. He will remember you. By the way, he will also remember your company. 2. Send some good MMS, SMS, condolence words or interesting articles to customers on holidays. Let customers feel concerned and he will think that you are not doing it just for sales promotion. 3. Remember customers' needs and notify each other by mass SMS as soon as possible. For example, customers want some latest clothes, and you can use * * * when new goods arrive. Show your enthusiasm. It is said that the highest level of doing business is to become intimate friends with customers, so that customers can feel that you are trying your best to put yourself in his shoes and really solve problems for them. 4. Classify customers, and the grades A, B, C and D can be determined according to their own requirements. Define the frequency of sending short messages for different customers.