Every time I go to the mobile business hall to charge the phone bill, I will receive a short message? How is this achieved? Is the software still sent manually?

It's sent by the mobile company system, just like your mobile phone bill is less than 10 yuan, and you owe money to stop. It will give you a message. It will be detected when the phone bill is paid, and it will be sent later. As you said, it was sent manually. I don't think anyone is doing this job. Think about it. How many people pay the fee every day? I'm exhausted.

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