Just drive through the custom, put the phone in the bag. If they ask you, just say you are coming back from relative wedding. I once carry back 5 PS3 to sell and hide under the car seat because it is too big No problems. Always bring back stuff from SG for years and it has never been a problem.

I am using DiGi for my iPhone 4 and its really bad. Can't wait till my contract ends and I'll be porting back to Celcom. Celcom is the best when it comes to coverage. Slightly more expensive but solves most of the problems im facing.