Except that SMS is not guaranteed and becomes less likely between carriers. "Message delivery is "best effort", so there are no guarantees that a message will a

Except that SMS is not guaranteed and becomes less likely between carriers. "Message delivery is "best effort", so there are no guarantees that a message will actually be delivered to its recipient, but delay or complete loss of a message is uncommon." [1] 1. http://en.wikipedia.org/wiki/SMS http://en.wikipedia.org/wiki/SMS