Twitter kills SMS service in some countries over costs. Will someone kill SMS already?
venturebeat.com
venturebeat.com
In my previous start-up we ignored that fact, and we failed. Unfortunately, the mobile space is not as "free" as the Internet. Especially here in the US, we basically have an oligopoly, so don't think you can just build something and "put it out there"... Everything you do will have a cost, and someone will have to eat that -- Either you or your customer.
Even now, some of my friends will "ping" me with SMS and then we will switch over to GTalk to save our monthly messages, especially if we plan on having an extended convo.
They will block apps in a heart beat that will deliver a cheaper way to pass massages.
Please remember that you (bparter) are the minority when talking about SMS