Thanks for this info: I knew about them but only in Wuhan. One thing you mentioned is that these people can use your personal information for all sort of sinister purposes.
One of these is identity theft and an FT could have various debts incurred in their name and also be charged with criminal activities they had nothing to do with. Those mobile numbers are all from Wuhan as far as I know, 1397 is a Wuhan mobile prefix to my knowledge or was when I was there. I will try and find out more about these individuals.