Why can't Apple 6plus receive SMS verification code?

What should I do if Apple 6PLUS fails to receive SMS verification code?

1、

When passing through the gateway, abnormal network communication may cause the loss of short messages or delay the reception of short messages. Please be patient.

2、

The mobile phone is not in good condition and the signal is poor. I suggest you try to turn it off for about 30 minutes, or take out your mobile phone card and install it on another mobile phone and try again.

3、

Please check whether the SMS interception system is turned on or some SMS interception software is installed. It is suggested to install a mobile phone card and try again, or open the SMS interception software to check the SMS interception situation.

4、

As a security verification tool for accounts, mobile phones are not used for a long time or by themselves. It is recommended to replace the bound mobile phone.

Mobile phone if

I don't have it with me at the moment. I suggest my family (friends) return it. If you are in a hurry, you can ask your family (friends) to forward the verification code before operating.

5、

You can't receive text messages when your mobile phone is down or in arrears. If the mobile phone still works, it is recommended to recharge the phone bill before operation.

6、

If you use Express Pay to pay or sign a contract, Alipay has changed its number, but the SMS is still sent to the previous mobile phone. Please contact the bank to modify the mobile phone number reserved by the bank and try again.