Hey JeffreyKMTan, are you still facing the same problem?
Please leave your details over at http://bit.ly/StarHubCares and we will help you look further into this matter.
If you happen to stay in the bad or poor signal areas.. you may wanna consider homezone http://www.starhub.com/mobile/mobilevalueaddedservices/optionalmobilevas/homezone.html
only coverage in outdoor areas regulated. your house.. private area. =S
hmm.. you seem to be in many place on a daily basis. are you actually referring to the time when you are on the mrt train?