Why Cambodia is not on country list ?

Hi,

At present, setting up iCloud Keychain with SMS is not supported in Cambodia.

However, you can use the steps in iCloud Keychain availability by country and region to set up iCloud Keychain without an SMS-capable phone number. I've copied these below:

If you're on a device with iOS 7.0.3 or later

1. Go to Settings > iCloud > Keychain.
2. Enter your Apple ID password.
3. When asked if you want to use your device passcode as the iCloud Security Code, tap Create Different Code.
4. Tap Advanced Options, then choose one of these options:
   • Get a Random Security Code.
   • Don't Create Security Code. Choosing not to create an iCloud Security Code means that your iCloud Keychain is stored only locally on your device and updates only across your approved devices, not with Apple's servers.
5. Follow the onscreen instructions to complete setup of iCloud Keychain.

If you're on a Mac with OS X Mavericks v10.9 or later

1. Choose Apple () menu > System Preferences. Click iCloud, then select Keychain.
2. Enter your Apple ID password.
3. Click Advanced, then choose one of these two options:
   • Get a Random Security Code.
   • Don't Create Security Code. Choosing not to create an iCloud Security Code means that your iCloud Keychain is stored only locally on your Mac and updates only across your approved devices, not with Apple's servers.
4. Follow the onscreen instructions to complete setup of iCloud Keychain.

To suggest this feature to Apple, please visit http://www.apple.com/feedback/icloud.html.

Apple are not formally represented in Cambodia other than through IONE who, as you know, are authorised re-sellers. Do you have a problem to resolve?