From my experience of using Maxis postpaid, they did not charge me anything despite my line is in 4G mode roaming. Roamed in Thailand, Japan, and UK last time as some area no 2G and no bill shock so far. They just charge based on my usage during roaming like Calls and SMS.
Phone setting I just turn off the data and data roaming and good to go.

The same goes for my company Digi line where usually I will subscribe to their 3day data pass (RM25). They just charge the amount I subscribe to only.

I think setting 2G is not the main issue as newer phones may not have 2G force mode like iPhone [4G/3G] only and certain countries like Korea or Japan no more 2G network.. so either is flight mode all the way in Msia first

This post has been edited by incredibless: Aug 25 2021, 09:45 PM

I tried celcom many years ago and in fact gave a try last year when I move in my house where only Celcom does not have signal (not even EDGE) in the house. Once enter my house no signal at all and outside the house only 4G one bar.. . In fact other telcos maxis,digi,umobile after one year the area VP, they come and set up the tower with good signal 4G. In fact, you switch to Umobile actually not bad as many places has quite good signal where my wife kampung only has Umobile signal.

This post has been edited by incredibless: Sep 1 2022, 09:02 PM