Once my maid arrive my home, I strongly restrict her to have a mobil phone. She can use my home telephone for any urgent call and of couse I can check any call she dailed/received. Until now almost 7 month she's very good, no mobil phone.
When 1st day my maid come, she told me that she got a phone "Nokia" but w/o HK adaptor.
She works here for one month & she said she will only buy a sim card when she got her 2nd salary.
But she promises to me that she will pass the phone for me during week-day. And just return back to her on Sat. evening time.
(So, I will look & see)
I allow her family to phone to my home only with emergency case.