Another way to call home is to use the internet. Internet phone calls are very cheap from Sihanoukville to the US, Canada, Europe (including the UK), Australia, and New Zealand.
Most hotels or guesthouses offer internet access to their guests, but if there is none, one could always go to the numerous internet cafes around town. An hour’s usage is around $1; the shop may charge a minimum amount. However, the connection may be slow or spotty.
Wifi access is also gaining popularity in some hotels, bars, and restaurants. Check if it is free or if a PIC card needs to be purchased to use the wifi.