Teacher Liu, yesterday I got a call from an unknown number. The person said they could switch me to a cheaper mobile phone plan.

Did he keep pushing you to decide right away?

Yes. He said if I didn’t sign up today, the discount would be gone tomorrow, and he asked for my ID number.

Then you were right to hang up. A truly legitimate service won’t keep rushing you, and it definitely won’t casually ask for important information.

I was a little afraid of being impolite, so I said, 'Sorry, I don’t need it right now.'

That was good. On unknown calls, don’t give your name, ID number, bank card details, or verification codes.

What if he calls again?

You can hang up directly or block the number. Don’t chat with him for too long.

Got it. From now on, when I hear phrases like 'sign up right away,' I won’t believe them immediately.