Out of curiosity I wrote a plugin for Easy Send SMS. The HTTP API is simple, and easy to use by playSMS.
It’s untested as I haven’t got any reply for test account from them (the free 15 SMS for testing). Maybe because its weekend now :)
Here is the code:
https://github.com/antonraharja/plugin-easysendsms
Enjoy.
playsms.org 
Did you receive any feedback from EasySendSMS? I think that these guys may be scammers….
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I checked again my emails, I did not get the reply for registration from them, so I haven’t tested it.
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