Can I still receive SMS in offline mode?

First of all, it depends on the validity period of the information you set yourself.

This setting is in the information settings. There is an information center number and the validity period of the information.

If the validity period you set is one hour, the messages you send while your phone is offline will be valid for one hour before you cancel the offline mode. After one hour, if you haven't canceled the offline mode, the message will be invalid and the other party will not receive it.

The same is true for 24 hours.

I hope I can help you.