A message to any mobile number, even one you never chatted with.
Steps
Open your Freffo group in WhatsApp.
Type, or say it in a voice note: "98xxxxxx10 ko bolo kal maal pahunch jayega"
It goes on send; a message that reads like an offer, or the same text to several new numbers, is warned about and asked once more. A number without a country code is read as your own country's.
Then you can ask
“Is number pe message karo ki site visit 4 baje hai”