Some interesting points in their terms and conditions

5.2 Peer-To-Peer and File Sharing Software 
    5.2.1 Certain software/applications which is used by a small number of customers to send and receive files containing very large amounts of data (including without limitation traffic from peer-to-peer software/applications (such as Bit Torrent, eDonkey, Gnutella) or file sharing software (such as Limewire)). These activities may cause network congestion and can negatively impact the speed at which other customers can access the internet.
5.2.2 Maxis does not guarantee a service level and/or connectivity to users of peer-to-peer or file sharing software/applications.

5.3 Excessive Usage 
    5.3.1 Each customer's total usage per month shall NOT exceed 3GB of data volume transmitted (total upload and download usage). This is to ensure that no individual hogs the bandwidth at all times. 
5.3.2 If a customer wishes to use more than the volume permitted, a written request should be made to Maxis.
5.3.3 Maxis reserves the right to reject the said application or charge for any additional data volume transmitted from what is already allocated.

4.8 Maxis may, at its sole discretion, automatically disconnect the customer's internet session after a period of inactivity, which may vary from 20 minutes to 30 minutes. This automatic disconnection is to allow maximum network performance.
I am very concerned about the 3GB data transfer limitation. Is that is a warning or do they actually cap the data transfer to 3GB per month?