if you sent out 2-3 smses and still no reply, you know the
answer already. me mean 1 sms.
sometimes people are afraid of hurting other's feelings by saying a
downright no, hence even though sms also dont want to say no. i am
not talking about asking your friends whether they want to go out
here.
when you call them directly, you 'confront' them for an answer. yes
or no, you can tell from their reply. if no, they will come up with
1001 excuses and you shld know the answer by then.