Sending short messages usually fails for several reasons.

There are usually several reasons for the failure of sending short messages. SMS verification code has now become a standard in almost all industries on the Internet, and plays an important role in account registration, password modification, payment confirmation and so on. At present, the short message service of the third-party short message verification code platform is accessed through the short message verification code interface, and more than 99% users can basically receive the verification code in a few seconds, but there will be cases where a few users can't receive the short message verification code. So what are the common reasons why SMS verification code can't be sent or received?

In general, the reasons for not receiving SMS verification code can be roughly analyzed from the following aspects:

First, corporate reasons.

1. When designing SMS verification code to send content, enterprises should pay attention to whether there are prohibited words in SMS content.

2. The signature format of SMS verification code is incorrect or inconsistent with the signature submitted for filing, which will also lead to the failure of sending.

3. The number of times of obtaining the enterprise SMS verification code exceeds the set range. 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, users with the same mobile phone number or the same IP address can send SMS verification code up to 5 times a day, 2-3 times an hour, and the effective time is 10-30 minutes. If the set number of times is exceeded, the distribution will also fail.

Second, the reasons for the third-party SMS verification code platform

1. Does the SMS channel provide a direct channel for SMS operators? If not, the SMS verification code may be delayed or unable to be sent.

2. Whether there are multiple backup sms channel when providing the main sms channel, because it is unstable in sms channel, and there is no backup channel, which easily leads to the failure of sending SMS.

3. Whether the interface of SMS verification code is stable enough, whether the interface technology supports high concurrency, and whether there will be problems such as system crash, system error, failure of SMS verification code acquisition request when users visit a lot.

Third, the operator's reasons

Usually, the operator's problem is relatively small, but it is also possible that in the process of sending, packet loss is very small and can be retransmitted.

Fourth, user reasons.

It is common that the SMS verification code cannot be received due to user reasons, as follows:

1. The user's mobile phone number has been blocked by the operator, so the user can call the operator to cancel.

2. When the user's mobile phone is in the blind area of signal coverage (such as basement, deep mountain, etc.). ) or a network signal shielding area (such as parts of Tibet, etc. ), you may not receive the SMS verification code.

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

4. Intercepted by SMS interception software.

5. The user has set a blacklist in the mobile phone security software, and some mobile phone numbers are not allowed to send text messages to themselves.

Generally speaking, there are many reasons for the failure of sending SMS verification code, which may be that the receiver's mobile phone is down or the signal is not good, or the content or signature of the message is wrong. Of course, it may also be the channel quality problem of SMS verification code platform. For enterprises, it is still necessary to reasonably design the sending content and acquisition times of SMS verification code, carefully select third-party service providers, comprehensively evaluate whether they provide direct access channels for SMS operators, whether they have backup sms channel, and whether the interface of SMS verification code is stable, and decide whether to access its SMS verification code function based on the actual use effect of many tests.