Apple mobile phone can't receive Tencent classroom verification code.

It may be down or the network signal is not good. Please close it and try again.

You can't receive SMS or verification code for the following reasons: You can check whether the mailbox is full first, and if it is full, please delete some information; I still can't get it after deleting it. You can change the machine or card to see if it is a hardware factor. You can try to test whether it can be received in other places and see if it is the reason for the weak local signal.

Check it in phone settings, open the phone settings icon, and then click information options. Click the unknown and filter information options, and then turn off the button to the right of filtering unknown senders.