Can't the SMS center with SMS mode be charged for mobile phones? How to get the validity of SMS?

Just say that there is nothing in my mobile phone. How can you arbitrarily deduct my money? Then he will give it back to you and cancel the attack. My friend sells mobile phones. I won't know until I ask him. After the cancellation, this will not happen! China Mobile Level 7 20 10-09-26 changed the number of the SMS center, which can only prevent sending messages when some services are opened by mistake, but it cannot prevent the Monternet service from being delayed. This information fee-on-demand service of Monternet does not need to be cancelled, because it is not a monthly service. As long as it is not on demand, there is no charge. Question: When setting up, there is a short message valid for one hour, one day, three days and one week under the short message center. What is the maximum value? Answer: As long as you don't set it back, you will never send a message. Question: Will there be no charge? If so, I will cancel the Monternet master switch. Are you sure? Answer: As long as you mess up the number of the SMS center, you can't send a message. You can try. Mess up the center number and send a message to 10086. If the information fails, you should believe it yourself. This is the most correct supplement: the validity period of the short message is the date when the short message is saved. If this setting is not set, you will not be able to send short messages. If you want to send a message, you have to set a number in the SMS center, which is confusing, but you can still receive messages from others.