[chrismetcalf]

I agree. Anything that I can do for free in 5 lines of code or less (email, Twitter) should be sub-one-cent or less. I'd gladly pay for services like phone and SMS, although it seems odd to me that SMS is more expensive than a phone call.

[rokhayakebe]

One minute of phone call would probably cost him/her 2.5-3 cents while one SMS will cost him 5 cents. The cost to send/receive SMS will not go down unless you buy hundreds of thousands at the same time.