Update:
As predicted, my-cool-sms has turned to be a premium service. But Ramachandran has suggested another website OOSMS providing free SMS to most of the countries worldwide. The downside is, you have to signup for the service and all messages will be accompanied with ads. Though the registration process is straight forward, I am apprehensive about the SMS I received asking me to Unsubscribe for Tagga by sending an SMS to some other number. Its still free anyway!
Update2: A list of Websites offering FREE SMS is being maintained here! Hop in!!
This is a no-nonsense and absolutely free service from my-cool-sms.com. I have seen lots of websites previously offering free SMS, but they always failed to impress me, either because of inconsistent service or their extreme advertising model. But this one is devoid of both. Currently free sms is provided for 10 countries – India, United kingdom, Austria, Czech Republic, Estonia, Germany, Ireland, Norway, Poland and Taiwan.
There is no registration process involved and the delivery of SMS is guaranteed. I personally checked sending few SMS and it was delivered within seconds. Amazingly enough, they provide delivery report of each SMS sent!
Regarding how the service can be free, the website says -
The public website is a test. Anyone can use it. If the ad revenues will cover our expenses we will keep it public and maintain it.
It surely doesn’t hurt if we click few ads and get free SMS in return, isn’t it? 
Link: My-Cool-SMS
sounds interesting… i might check it out… do you know if it works for Greece?
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You may wants to check out http://www.oosms.com
date :12-09-2009
the web site not in working.
I just tried and its working fine!
@Stratos,
Nope. Greece is not supported as of now. http://www.oosms.com supports Greece as well
@Rama,
Thanks a lot for the info, I have updated this post
THANKS BUDDY
Works well with UK and also from UK to Ireland. Thanks for this great tip!
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Really appreciating, rock you man.
Pleasure is all mine Samir
Hopeless shit! Pranking possible!
@abhi,
That’s the flip side of any technology
I would try this site:
India SMS
They also have FREE Picture messaging at:
FREE Picture Messaging India
You can also Send Free SMS India at http://www.hai91.com
Its reliable and have a lot of features to send SMS.
@Dev,
Thanks Dev, updated the post
good
Hey guys have you tried using http://www.sendafreesms.co.uk?
Hi Raju…I think you are wrong abt one thing here in this post…my-cool-sms.com is not a free service and it requires registration…Is there any other ways to use it free?? I have asked the same on Twitter too..:)
@Anish,
am sorry, but I wonder how you skipped reading the updates on top of the post. I have clearly mentioned about my-cool-sms turning premium
Ah…sorry…my bad!…Thanks for your reply…