What do you do with text messages from people who often change their numbers?

If you are still at school, I don't think this problem is serious. When I was in college, I sometimes changed my card every semester, because there was always a more affordable card at the beginning of each semester. But if you have entered the society, I advise you not to change your number frequently. Bosses and colleagues tend to think such people are unreliable.

Some people are really disgusted to see you change your number frequently. Some people may be busy when you receive short messages and have no time to save your number, so you forget it later, so even if you have to change your number, you should call more important friends or use multi-channel notification methods, such as QQ messages. If you send a text message, you'd better write your name in front. Some people instinctively resent seeing strange short messages and deleting them without reading them.