I think cold call messages from WGs depends where you are. I'm always in the Causeway / Wanchai area and I've received random messages before. I think also if you try out one of the girls (Indos or maybe the spas), they must circulate your number or something. I'll go weeks with no invites, and then I reach out to a girl myself and if out drinking, I suddenly have two or three invites. Nothing like Bangkok or Jakarta of course. I received a message from a Thai girl in Wanchai last year. We're still in touch. So while Wechat can be a royal pain, it does offer some gems. 
I was in Jakarta recently and in one night alone out for drinks, I had no fewer than 15 invites for massage or even "sex". So so blatant. Felt like some were agents but also many freelancers. Some sent me pictures if asked, some didn't.
Oh, and BTW dick pix are ok on Line, but there is no way to filter men vs woman on that app (if anyone knows, tell me), as there also seems to be a fair number of gay guys using that app as well so suggest you mention your preference. 
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