If the courier doesn't answer the phone, will the courier send it back? Or will you send a text message to remind you?

There are many possibilities. The responsible courier will bring it back and contact you the next day. Or put it in the property and call you later. It's already in the property.

Secondly, I will also tell you by SMS that it has been put in the property.

If you meet irresponsible people ... there is nothing you can do.

In fact, you can also call the courier to confirm when it is convenient to pick it up or leave it in the property.