Can you see the content of our short message with your mobile phone?

Hehe, I study communication. SMS is very popular in China, but no one thought that at the beginning of the invention of digital mobile phones, SMS was used to detect the bit error rate of mobile phone signal transmission. At that time, you could completely see the content of the short message at the transfer station. In other words, mobile can watch it now if it wants to, but because the national laws emphasize privacy more and more, it dare not watch it without the permission of the public security department. It's like putting money in the bank, but the bank is afraid to change the numbers in your account.