Thank you for you reply. I remember below, so wrote only.

How about below situation?

https://forum.lowyat.net/topic/4480216/all
GPRS charge

Now when 2g and 3g upgrade to 4g still happen deduct money when open 4G? But above not small money and the CS also told me, my sim at system always shown money have been deduct, but I check my balance nothing lose. CS told deduct like 0.00099, so I cannot knowing it.