ahahahhahahaha its much harder to reject on the phone mahz. if u
sms, the person got time to think riaos, may start to recollect
what a creep you are and then ..... !!!! 
actually, phone is cos even if got rejected still can ask again
and also see what excuse was given lah. if very obvious then zi
dong a bit mahz.
Wah you expert sia.... :-P
true. On phone is harder to reject but she might SMS later to
reject leh. Nowadays ger got lot of pattern one... ;-)
