Why can't the mobile phone receive QQ SMS verification code?

There may be the following situations:

1. The phone is out of memory. If the memory is insufficient, the mobile phone can't receive short messages, and it can only receive short messages after clearing the cache.

2. The mobile phone is in arrears or stopped. In these cases, it is impossible to receive text messages.

3. Has this message been blacklisted before? It needs to be whitelisted again.

4. You can't accept short messages and phone calls if the cell phone signal is not good.

SMS verification code

SMS verification code is an effective verification code system by sending verification codes to mobile phones. Both large websites, especially shopping websites, have the verification code function of SMS, which can ensure the safety of shopping more accurately and safely and verify the correctness of users.

Some authentication code providers provide SMS authentication code service. Each website sends a request to the provider's server through the interface, and the server sends random numbers or letters to the mobile phone, and the provider's server verifies the authentication code uniformly.

reference data

Baidu Encyclopedia-SMS Verification Code