Apple's mobile phone failed to send SMS.

The reasons why Apple's mobile phone failed to send SMS include: network problems, SMS center settings problems, SMS storage is full, SMS content problems, and other reasons.

1, network problem: If you can't send SMS, first check whether the network connection is normal. You can try restarting your phone or airplane mode, and then try again. If the problem persists, you may need to check your network settings or contact your operator for help.

2. Settings of SMS center: In some cases, it may be necessary to check the settings of SMS center. You can find the SMS center in the settings of your mobile phone, and then confirm whether the settings of the SMS center are correct. If the SMS center is not set correctly, it needs to be set again.

3. SMS storage is full: If the storage space of the mobile phone is insufficient, you may not be able to send SMS. You can view the storage space of your mobile phone, delete some unnecessary files or applications, and free up the storage space.

4. SMS content problem: If the content of the sent SMS contains sensitive words or violates some regulations, it may be impossible to send SMS. Need to check whether the short message content meets the requirements.

5. Other reasons: In addition to the above reasons, there are other reasons that may make it impossible to send SMS. For example, the mobile phone may have a hardware failure, or the operator may have some problems. In this case, you need to contact Apple or the operator for help.