These WGs rarely reach out on their own accord even after you've exchanged contacts. They are generally very discreet about it.
Having said that, there were a few girls that did reach out to me.
One was a sexy little minx from Xian. We didn't exchange contacts the first time I met her, but we did have a hot session. I guess she liked it (and the tip I left her!) because the next day she asked the Mamasan to contact me asking me to see her.
It was a funny incident... The Mamasan later told me that she asked for me by saying "that guy from <a certain SE Asian country> who's your regular who saw me at noon yesterday", lol!
When I arrived for the booking, I sensed that they may have been talking about me because the Mamasan gave me some sly looks and put me in a room that was right behind the reception area. That room is terrible because it's very easy to hear anything happening in the room. FMD, my girl was extra loud during the sex... I knew straight away I'd been tricked by these ladies!
Another one kept making video calls to me even when she knew I had a partner. I had to block her.
And others were very discreet, only short messages asking if I'm busy.