"用過Hemat、萬年用緊Kabayan $88 plan,坐地鐵去到某啲地鐵站試過講講下電話會冇咗聲/斷線"
3, CSL, CMHK voice -> drop line, I don't think SMT will have exception la.
Of course, you can try but my experience in SMT is no good. CMHK the best, then 3,..................
I don't have any idea as I'm not always in MTR. For my experience:
MTR: SMT slight better than 3 > CMHK > CSL
Other: CMHK = CSL > 3 > SMT
In general: CMHK > 3 > CSL > SMT