I have some of my friends living in UAE and Iran, Is there any site which gives free access to send sms worldwide?

I have some of my friends living in UAE and Iran, Is there any site which gives free access to send sms worldwide?


So far I am using this site: Free SMS to UAE (http://ezfreesms.com) for sending sms text without delay, It's a simple site. Works great. But you cannot receive reply directly online. Instead you can chat each other using phone numbers