Skebby offer a very good free sms service, when tested by TextMeFree it worked very quickly to the UK and Spain, and it's a worldwide service, so text any country for free. You get 3 free sms daily. The site is easy to use, just requiring the country code and mobile number of the recipient.
The sms daily allocation gets used up quickly now that the site has become popular, so best visit in the morning if you want to use this service
Skebby is an app that lets you send free sms directly from your mobile phone to other Skebby users once