Why is my cell phone turned off, others call me, and there is no SMS notification on my cell phone?

If you mean that your number has been provided with the Unicom secretarial service, but you have not received the missed message of the call reminder, you can check the following situation:

1. Whether the Unicom secretarial service has been successfully opened;

2. If the phone is turned off or there is no information number for more than 48 hours, you will not receive the SMS;

3. Set the call forwarding function to other numbers or cancel the call forwarding function;

4. Whether the mobile phone is equipped with Unicom's letter shielding function. If it has been blocked, it needs to be restored before it can be used;

5. Check whether the SMS interception function is set in the mobile phone security software. It is recommended to turn it off and see if you can receive it.

If this is not the case, I suggest that you can contact the Unicom customer service where the number belongs to check it.