Will the text message be lost?

(1) If the other party shuts down, will my short message be lost?

No, most people will say so, but why, I believe not many people want to know. Well, if the other party shuts down, the messages we send will be stored in a place called SMS Center. If the other party turns on the phone, it will notify the SMS center and send the saved SMS, so that there will be no problem of information loss. Each of us has a setting in the SMS sending function of the mobile phone, which is used to set the maximum SMS storage time. In other words, how long do you want to keep your message in the SMS center if the other party is turned off? Of course, we hope that the bigger the better, it is impossible to say that it will be turned off in two or three days.

(2) What is a status report?

We sent all the text messages, and we are very concerned about whether the other party received them. It's simple. Just set the status report in your SMS, which means that if the SMS center has sent your SMS to the other party's mobile phone, it will send you another SMS (status report) to tell you that your SMS has been sent successfully.

(3) SMS and fees

Every mobile communication user, whether Unicom or mobile, has an account information in our home (the so-called home is where you access the mobile communication network, such as Guiyang is your home). In fact, it is a simple database with how much money you have charged. Every time you send a short message, the short message center will send a message to the deduction center, and it will deduct the corresponding money from your database.

(4) About roaming

Sometimes we go out to travel, for example, we are mobile users in Guiyang, and we travel to Guilin, Guangxi. When we enter Guilin, Guilin Mobile will send you a short message: Dear Guiyang Mobile User, XXXXX ...! You will feel strange, hey, who told it that I am a Guiyang mobile user? Nobody. It's your cell phone. Think about what's in your phone, SIM card? SIM card stores your personal information, such as your native place, mobile phone number and so on. When your mobile phone is turned on, your mobile phone will send wireless signals to the nearest communication base station every once in a while, which is called "handshake" from our programmer's point of view, that is, exchange information with each other every once in a while to ensure the effectiveness of communication between the two parties.

For example, Party A and Party B communicate and shake hands:

A: I am still alive!

Response a:

I know you are not dead. Let's move on!

So, when you roam to Guilin, your mobile phone sends a signal to Guilin Mobile. After inquiry, Guilin Mobile found that you are not a local mobile phone, so it asked for your user information, so your user information was reported again, and then they began to greet you:)

Having said that, let's talk about eavesdropping. It's really easy to eavesdrop on text messages. Open an interception program (really a simple program) in the short message center and specify the mobile phone number to intercept, and the short message can be intercepted. There is an easier way, that is, just look at the bill. In fact, all of us send short messages every day, and every short message will be written into a bill in the central computer room of China Mobile or China Unicom (recording the contents of the short message, the documents of the sender and the recipient). Of course, the general bills are confidential for service, but I still see some historical bills because of some work needs. I once heard that my colleague once went to XX mobile site to participate in the program upgrade work, and needed to receive a call list of about 1 hour for analysis. Later, let's look at those bills.

There is a lot of content in the room. This is really XXXX. Everything is a mess. The more you watch, the more interesting it becomes.

Eavesdropping on the phone is the same as texting, so I won't say much.

Let's talk about another interesting thing. A friend of mine used to send harassing text messages to his girlfriend in Unicom's computer room, and sent N messages, because he couldn't see the sender's mobile phone number and his girlfriend didn't know what was going on. Later, her girlfriend's mobile phone stopped working and finally turned it off:) Later, she told us about it, and we all secretly laughed.