Sometimes I also dun ever understand how they count it... Every month I checked my unbilled amount not exceed than 155 but when the bill came out 200++ ,I called customer services before and they told me a lot of reason said I use sms a lot some said I use data bla bla... But one thing is they told me unbilled amount is mean those tat I used not include freebies...kinda blur here...can someone tell me what is unbilled amount?