Why do I sometimes need SMS check code and sometimes I don't need it when I pay for mobile phone Taobao? The payment amount is within 100.

1. If charging SMS verification service is launched (0.6 yuan /3 1 day), you need to enter the mobile phone verification code for each expenditure (the transfer and withdrawal of Yu 'ebao are not verified).

2. Some banks will send text messages in their own banks. When the bank SMS and SMS verification services are duplicated, only the bank SMS is sent. Such as Bank of Communications, Shanghai Pudong Development Bank and some postal banks.

3. The system will perform a security check. From the security point of view, it may randomly ask for the mobile phone verification code to improve the security of the account.

4. The above rules are not applicable to wireless terminals, which have their own security inspection rules.