Just plug in your Galaxy Anycall to your pc via usb cable and let Samsung kies recognize your device and connect your pc to internet and wait.If any official update is available it will tell you and you can upgrade it to 2.3.6.Make sure,to backup your contacts,apps,games and other imp. stuffs before updating.
Or else,if your device doesn't get an official update just type GALAXY ANYCALL ANDROID DEVELOPENT and click link of xda-developers and see if any developer has ported or made an unofficial update.
All The Best!