SMS can we ??
 

I just wanted to know if we could send SMS for free the world over on GSM phone ??...
anyone who knows ??

For free? I doubt it... However, many ISP provides that service for quite an affordable price. If you ISP does not, you could create an account at www.linuxmail.org (free service) and you can send SMS (non-free) at an affordable price:

25 credits/month = 3 USD
40 credits/month = 5 USD
100 credits/month = 10 USD

you can even choose to receive SMS on your linuxmail inbox if you want. Now, don't take me wrong, there could be some free service somewhere, but this is a cheap as it gets I believe ;)