Not sure, but I would recommend that the OP be careful getting into the business of sending Bitcoins for SMS/phone.

Even DialCoin is a dedicated site with state of the art fraud prevention technology and we only work with processors who are worth the trouble, but still we get constant fraud attempts, chargeback attempts, etc. It's all part of the scammers game. If we didn't have the experience and knowhow we do, we'd be bankrupt because frankly speaking SMS for Bitcoins is a high-risk, non-viable business in itself. Even DialCoin has had to make some tough decisions to decrease risk (which unfortunately decreases some functionality as well).

The payment processor they are apparently using, Zaypay, is one of the many payment processors DialCoin looked into about 6 months ago and we found their terms to be dangerously risky and easily defrauded. I say this with the utmost respect for Blockchain.info (because I think it's a fucking kick-ass service):

You have no idea what you're getting into.


EDIT on April 1st, 2013: Now a year later, I noticed that you are no longer allowing BTC to be bought by SMS. I won't jump to conclusions as to the reasoning for this, but I am happy that you removed that risk factor from your site.