Free SMS To Mobile Phones Working ?

Do Free SMS To mobile phones Shown in most internet websites work? I think no.i have tried so many websites which offer free SMS.But they are actually not working.Free SMS provided by some websites work , while some wont work.

I recomend you not to use such websites.I think you all will be facing the same situation link me.
I am expecting some comments from you also friends.

Plz drop your comments!!!