Why does the password of postal online banking SMS come too slowly?

Generally, there are only two situations: mobile phone number and network delay. In general, the probability of network delay is higher, just like logging in with a mobile phone dynamic password. Once I sent three short messages in a row and didn't reply to me, so I had to log in with a fixed password. When Alipay paid for the transaction, I also encountered such a problem, that is, when I clicked to send the verification code to my mobile phone, no matter how you clicked, my mobile phone could not receive the verification code and could not conduct the transaction. The reason they gave was that the network port could not receive 100% of the sent short messages. As for the mobile phone number, it is not a big problem, because the performance is relatively stable today. If your short message often fails, it may be that your information has been leaked and stolen by others, because the mobile phone number is an important means to modify the password for trading. Of course, there are good things. I don't know if you have registered your number twice in the same type of bank, which may also cause your number to be invalid. But then again, since your mobile phone can receive information, it should be just a network problem.