What is the principle and legitimacy of the mobile phone verification code receiving platform?

SMS: I just said that a cat pool is the same as a mobile phone. To put it bluntly, your own mobile phone is a standing cat, so he sends and receives text messages just like a mobile phone, except that he needs to operate it on a computer, because he doesn't have a display screen, so if we use software, we can realize automatic reply and automatic reception ... Of course, he is the same as a mobile phone, so he also has requirements for signals. You can see the antennas in the picture above, each with one on it. Voice: Here is how to answer the voice (voice verification code). When the website sends him a voice verification code, the computer will prompt which port to call. The corresponding cat pool has a hole for inserting headphones, which can be heard by inserting headphones. Speaking of which, you should understand why the verification code platform can't receive the voice verification code, because you need to answer the phone manually. At this time, you should understand that those platforms that can receive voice verification codes are deceptive. Some people will say: it says that the call will be forwarded to your mobile phone. Ok, I'll fill your brain. First of all, the cost of call forwarding varies from place to place. The cheapest from local to local is about 1.2 gross, usually 4.6 gross. These are all the money collected by China Unicom, China Mobile and China Telecom, and then the card merchants earn at least 1 quick money. These are batch call forwarding for you, just like a platform. Is it true that card merchants will one day stay on the computer and call you a set of phones, and one set is only 50 cents. Don't ask those voice verification code platforms in the future, just ignore them.