well... i am also guilty of that charge. sometimes i do 'forgot' to reply sms. unless the message is really important. sometimes, also because i am still thinking of how to reply then later forgotten.
if i am the sender, i will probably just send another one like 'so how? what do you say?' or 'oi! got receive my sms or not?'
ah... dun forget that sometimes sms can go 'missing'. especially between singtel and m1, somehow they just 'dun like' each other....
