There are loads of these adverts on AdultWork. Previously i would report them but after the misandry i experienced from AdultWork admin team they can go to hell. I despise AdultWork now, they certainly don't have the punters interest at heart.
Most of these people will ask you to WhatsApp because they generally have a throw away sim which costs nothing to keep active but to communicate they will use WiFi. If you send them a sms text they will receive but will not reply because they won't have credit.