Saving Tips - Calling back from Overseas

I travel overseas very often and I know it is quite expensive to call back to Singapore from overseas using a Singapore mobile line. I normally will get a local pre-paid line and then call back to Singapore using the local line. It is much cheaper this way. For example in Thailand, TrueMove(one of the mobile phone service provider) have a special inter sim which you can call back to Singapore at 1 baht/min (Around 4 cents per minute). Even if you are in countries like Vietnam or China, the local pre-paid line normally give very good rates when coming overseas. So keep a look out for them, if you are going overseas for a certain period of time.