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First, the user's own mobile phone number is blocked by the operator. You complain to the operator that this kind of notification message is spam, which makes the message blocked by the operator. Solution: You need to contact the operator to solve this problem.

Second, blacklist settings such as SMS security software, you set stricter interception rules in SMS. Solution: Check SMS blacklist settings, menu-> Harassment interception-> Settings, respectively, to see whether there is an interception mode and black and white list are not allowed to reach the number of SMS.

Third, the privacy settings of the internal browser of the mobile phone, the security level of the browser is too high or the setting of shielding "third-party Cookie and website data" is set. Solution: Reset the security level of the browser or turn off the setting of "blocking third-party Cookie" in the browser, and set-> Privacy settings-> Content settings.

Fourth, the number of short messages sent by its mobile phone exceeds the maximum limit of one day. In order to avoid short message bombing and waste of resources, some mobile phones set up a maximum of ten short messages per mobile phone number every day. Solution: You can't log in to the service that needs to verify your mobile phone on the same day.

5. Delay of network, wireless network, communication, etc. Due to network or geographical problems, there may be some delay in the authentication information sent by the server. Solution: Wait patiently, or try again after counting seconds.