The old machine sent a short message, please help me. I'm in a hurry. What's going on here?

Because you set the alarm service after changing the phone card, you will have this prompt when you are sensitive to the operation of the phone.

This situation of the old man-machine is generally that the mobile phone card is inserted incorrectly. Take it out and rub one side of the chip on the clothes a few times before putting it in. If not, try changing someone else's mobile phone card. If possible, it's the card. Just change the card. If not, it's the phone. It is suggested to repair it or buy a new one.

SMS can be set, when to send and when to send. If it is not set, it will be sent randomly, which is a virus.