I wanted to use the press mentions for ODF, since it's the exact same technology, which is why I mentioned "The PENNY SMS technology has been featured on"
So it seems you're using a bunch of GSM-modems with SIM-cards on "sms flatrate" contracts. Apart from the obvious scalability concerns I really wonder whether (or rather: for how long) the carriers will let you get away with that?
It's so much lower than what even the high volume gateways can afford that you're obviously not working on regular contracts.
Abusing their E-Mail/Web interfaces?
Sorry for coming across negative but I'm very wary about the reliablity here.
SMS sending is most often used for some sort of user-validation and usually during a critical phase of the conversion process (signup, transaction checkout etc.). Reliability is crucial at that point, which is why most SMS gateways offer fairly strict SLAs.
Do you provide any kind of guarantee that my penny transaction will result in an actual delivery? I'm asking because random hit & miss or "sorry, the t-mobile web sender was acting funny the other day" doesn't bring my lost customers back.
I also can't seem to find the TechCrunch mention that's claimed at the bottom of the front page. Can you provide a link?