As for making dolphin sms modules,
they would all be just a submit form or iframe and such - unless you squeeze an actual API in there also. (only reason I see - is easy install, maybe)
Dolphine module could be an interface to the sms API. (local or remote, paid or mystically free)


Houston.. Good point about knowing provider, perhaps this is cutting some cost with a cheaper, direct route?
Numbers are often moved to another provider, could look it up online almost like who owns what IP. Had see more a list, but was outdated fast. hehe

Clickatell is interesting for many sites, since they do not require a purchase of large quantum.
In my mind that is not a real advantage :) (probably one of the reasons they are big.. but i would not say best - and for sure not the first as they claim :)
Their sms sends where received quickly though, so it works well! :)

Meinecom.. For that use, the module is a nice addition indeed. Could just write on the page, there might be an ad showing in sms, then that is done right :) probably a good deal also, thinking about regular prices on sms abroad.

Anonymous spamming is a concern though, and most providers can spoof also :) Had some fun with that ;)

Sleepy time now,
looking forward to getting back to this :)