<quote who="Shaun Rossi">
Hello,
I have no idea what this is referred to as, so I will try to explain: I have a client interested in setting up a mobile phone text message service where a mobile user would send a text to a short (say 5 digit) 'telephone' number. I've seen commercials on TV where you could send a numeric/text code to a SMS gateway number, and it charges your mobile account for the returned text message or downloadable ringer/etc.
*snip* These are SMS short codes. Essentially you purchase service from an SMS aggregator (that's your missing key word) and you can bulk send your SMS through some sort of API or HTML gateway. They will generally have agreements with the mobile networks to have anything that is sent to a particular short code forwarded onto the aggregator so that they can make them available to you. A Google search for "SMS aggregator US" should point you in the right direction, although I've only had direct experience (and a few years ago now) with Opera Telecom in the UK. B