Please look for an advertising agency and they will help you with this. I often see them running ads with automatic messages like that. They will use 1 message with the same content and send it to many phone numbers. different. However, doing that will cost money. Wish you success.I asked the question wrong, I meant whether there are services that send SMS, for example, in SMS voting where people vote by sending SMS. But I think it's unrealistic, because there's no way to bypass the SMS price that the operator has set. In the past, there was a way to send a lot of SMS from a new card at one time and the card would go to the minus account balance, but that was a long time ago and it doesn't work anymore