Should you write "Sincerely" when sending text messages to customers?

No need to write your sincerely.

1. Yours sincerely is generally used in formal written sentences. Usually it is an application submitted to superiors. The customers themselves are on an equal footing. Text messages are generally verbal communications and are not very formal.

2. During the communication process with customers. Just be polite. There can be polite greetings and care. And paying respects once will give people a sense of seriousness. In addition, you will be given to customers who can treat you casually because you are a "subordinate", so your accommodation and good service are expected.

3. Get along with customers. You need to be neither humble nor arrogant. Even if you are selling, just think that I have good products to introduce to you. I am doing it for your own good. I am introducing it to you through a platform. I just need to be polite.