Someone on the cf-talk list asked about obtaining a SMS account and short code, and Damon Cooper posted a response with some valuable links. Here is an extract from his post:
Most of the major wireless carriers provide SMPP accounts directly (AT&T Wireless, etc) for access to a specific carrier’s wireless customers, but for access to cross-carrier wireless subscribers, you’ll need an SMPP account with what’s known in the biz as a “Connection Aggregator”. This company provides you a single, simple SMPP account, and then routes messages to/from the individual wireless carriers behind the scenes (using direct individual SMPP accounts for each, typically).
So who are these aggregators and where do you get one of these accounts? Here’s a quick set of pointers to a few:
Also, visit the Cellular Telecommunications & Internet Association’s Common Short Code Administration site for more about short codes.