I'd like to suggest you get in touch with Jason over at Global Acces -
Global Accés Alternative Payment Processing | Premium SMS Billing His contact info is - ICQ: 152263851 - YMSG: JUSTJSMS - EMAIL: jason at p2e dot com
Another alternative is
GXBill - Global Exchange Billing, Extend your Billing Options and Maximize your Profits
There are a few SMS Billers in the adult industry, those are definitely worth checking into. Good luck! Feel free to hit me up directly if you want me to point you to some forums that might also be of assistance.