TM is upgrading their core network today. Friday, 19 June 2009, 11 pm till Saturday, 20 June 2009, 6 am.
During the nationwide upgrade, all internet services will most likely go down. This includes VOIP, iTalk and home prepaid users.
Source: [Streamyx][2]
[1]: /wp-content/uploads/2009/06/TM-core-upgrade.png) [2]: http://streamyx.com.my/whats_new/whats_new.php?id=article_20090610