Its very easy to send free sms to any national and international numbers using GPRS phones..Although its not exactly free but i clearfy that the sms rate it costs is lower than your mobile operator offers.Just first you need a GPRS suscribed phone and then dowmload operamini to your mobile phone.(Downloading operamini is not compulsory,but it makes easier to use).Then turn off the 'view image' system in your browser which will low the rates.Then go to wap.wadja.com and then sign in to your wajda account or sign up if you dont have it.Just then compose a message and then send it to any of the international number you like for free.Just try once it really works.I already saved a lot of money in mobile phones using this service.