What is the reason why the verification code has been sent unsuccessfully?

The reasons for sending the verification code failed are as follows:

Enterprise's own reasons: there are forbidden words in the verification code short message, and the distribution failed.

The short message signature format of verification code is incorrect, or inconsistent with the signature submitted for filing. Distribution failed.

The collection quantity exceeds the set range. Why should I set the number of times to get the verification code? Wouldn't it be better for users to take it as many times as they want? Actually, it is not. In order to prevent being swiped, the number of times to obtain the verification code of each number every day is generally set. For example, the same mobile phone number can be obtained up to 5 times a day, up to 3 times an hour, and the effective time is 3-5 minutes. If the limit is exceeded, the delivery fails.

Operator reason

This reason accounts for a small proportion, but it is not impossible. What happens is that few packets are lost.

User's own reasons

The user's mobile phone number is blocked, so he can't receive the verification code SMS → call the operator's customer service phone to solve the problem.

Users are in places with weak signals, such as basements, or places where network signals are blocked.

The user's mobile phone is in arrears, turned off or even stopped.

There is interception software in the user's mobile phone, and the verification code message is intercepted. The user has set a blacklist.

The reason of third-party SMS verification code platform

The sms channel provided is not a direct channel for SMS operators, so SMS with verification code will be delayed or even unable to be sent.

Sms channel without backup, and when the main channel is unstable, there is no backup, which is easy to fail.

The third-party SMS verification code platform interface is unstable, and the technology does not support high concurrency. When users visit a lot, it is easy to have system crashes and system errors, leading to the failure of distribution.