In Reply to: carole posted by caznjabs on Wednesday, 28. May 2008 at 15:06 Bali Time:
All you will need to ensure is that your mobile is not locked to a particular company at home. If it is you won't be able to use a bali sim card.
If it is locked get it unlocked before you leave, or I believe you can get them unlocked in Bali but I don't know where that's done.