Where to Buy
SIM cards are sold at the airport arrivals hall, 7-Elevens and Circle K stores, and carrier retail shops in any major mall.
Which Carrier
The three major players are CSL, China Mobile Hong Kong, and 3 Hong Kong. Differences between them are marginal for most visitors.
Registration Requirement
Hong Kong requires real-name registration for SIM cards — bring your passport when purchasing.
Cost
A typical 8-30 day tourist SIM with several GB of data runs HK$78-188 depending on allowance and validity.
eSIM Alternative
Hong Kong has good eSIM support if you’d rather set up data before you land.