Do you want to reply to the text message?

1. Customer: Be sure to return it, but keep it short. If it's not too urgent, you can reply: I'll contact you again. If you have something to answer: I'm sorry, please call back at a convenient time around XX.

2. Friend: You can go back or not. It is best not to go back, because after all, the other party is inconvenient. Even if you don't ask him to go back, he will call you after the meeting.

My general practice is that the other party does not call directly during office hours, but sends a text message first: call me when it is convenient. This is more polite and safer. Anyway, it's a single charge now, and I'm not afraid that others will misunderstand you. You won't save the phone bill, hehe