Oppo mobile phone has two cards, and one receiving verification code is not delayed. What is the reason for the delay?

Oppo mobile phone has two cards, one is to receive the verification code without delay, and the other is the reason for the delay.

1. Call your mobile phone network operation desk and switch to manual service. Sometimes it may be because the cell phone network signal is not good, which leads to the inability to receive short messages.

2. Check whether the mobile phone is in arrears. Due to carelessness, the early warning information of telephone charges sent by operators may be deleted by mistake.

3. Check the storage space of the mobile phone. Because the storage space of the mobile phone is limited, the service message may not be received when the mobile phone is full.

4, query the blacklist, because some spam is often harassed, the blacklist will be used to pull the harassment number.