An Excerpt from SMS Channel web site owned by Google Labs:
“SMS Channels are temporarily paused due to rise in bulk SMS costs. We apologize for the inconvenience.”
Media Opinion of Gupshup (formerly SMS GupShup):
Existing SMS users of GupShup that migrate to the app will still maintain their profiles, history and relationships with other users. The service, previously known as SMS GupShup, will now be known simply as GupShup, reflecting it’s extension beyond SMS. (Source URL: http://gs.im/fvevx)
Excerpt from OnTextme :
Service down.Sorry, we’re undergoing some maintenance and will be back shortly!!!