Recently, phone users kept asking me how to call to Singapore and Brunei without using IDD and country code. Well, the secret is that

If you want to call to Singapore, you can always dial 02-xxxxxxxx instead of +65-xxxxxxxx The same goes with Brunei, you can call 080-xxxxxxx instead of +673-xxxxxxx

This arrangement has been there since ever. However a lot of people never use such method of calling before and stick to the country code. Anyway, found out that call using the exchange trunk is cheaper than calls going through the international gateway.