prepaid sim for use in HK for 3 to 4 months

Hi Ching

I am looking for a prepaid SIM for a visitor to use in HK with DATA and voice, with reasonable speed.

Kindly advise your recommendation and also cost for the SIM.

Thanks in advance.

reasonable speed meaning?
everybody has their own standard
Limited or Unlimited data per month?
How many mins of talk time you expected him/her will use?


unlimited data capable of whatsapp, with few photo.
1G - 2G / months
500 - 1000 mins voice call