i recently heard about mobile software from cellity.. etc.. that allows sending of free sms. no charge at all. it uses wap so the only charges there'll be is data charges.
wonder if it's better to stick to service provider's smses or wap smses.
I heard of these too. But i wouldn't call the free since you are charged when using GPRS or 3G. In the long-run, its much cheaper especially if you send messages a lot. Some programs use your PC to send SMS messages but i wouldnt exactly call it "mobile".