I want to add SMS to my service, tips/help/advice?
ivey: I've worked with mxtelecom (it was so-so), mblox (better than mxtelecom) and mindmatics (best experience so far).  The whole process will be frustrating from the beginning, and it never gets much better.  But it's doable, and if your service is compelling, there's a decent amount of money to be made.