Maxis users have always been very concern on their data usage all these years as they will be charged whenever their data usage exceeds their quota limit.
This will change starting 3rd December 2012 as they have just broadcasted SMS alerts to users informing them regarding this.
We have tweeted @maxislistens to verify this and seems that this is true.
Previously, users will be charged RM0.30 for every MB used. With this new term, users whom have subscribed to data plans 1GB and above will not be charged at all when their usage exceeds their package quota, instead the speed will be throttled down. Which means users can still use data but at a much slower speed.