How to send SMS to remind customers that they can be promoted to private banking customers?

Explain that you are an old user, because you have a good reputation, and now you can upgrade to a private banking customer.

Private banking service is a kind of banking service, which serves the rich and provides personal property investment and management services for the rich. Generally speaking, you need to have at least $6,543,800+in liquid assets to apply for such services in larger international finance companies or banks.