HeyWire is a Free app from AppStore to send international SMSwith a real phone number to any mobile anywhere in the world.
All you need to do is register with your email address and you will be assigned a phone number. You can send as many SMS to anywhere in the world for Free. Select numbers to from Contacts on iPhone to send you can also use it’s website www.heywire.com from PC/MAC Beta to send SMS.
HeyWire will soon be available for Android, GoogleTV, gaming devices and e-Readers in 2011.
You can upload contacts from your iDevice so that the incoming message shows Profile picture & do simultaneous text / messaging using twitter, IM, Facebook chat.