Why can't Hunan tax and social security receive SMS verification code?

The mobile phone is out of memory. The lack of mobile phone memory will cause the mobile phone to be unable to watch pictures normally or even get SMS verification code, so Hunan Tax Social Security does not have SMS verification code because of the lack of mobile phone memory. Social insurance refers to a social and economic system that provides income or compensation for people who lose their ability to work, are temporarily unemployed or suffer losses due to health reasons.