Can VoIP send short messages to mobile phone numbers? Can you reply?

Can only say that some can and some can't. . .

Different brands of VoIP are implemented in different ways. Some brands of VoIP are bound to your current mobile phone number, so the sender will display your mobile phone number. . .

Some brands of VoIP randomly send numbers, and we can't find out who sent them.

If the landlord doesn't know if he is using a random number, he can ask customer service.