How can I obtain UMTS-SIMs?

Hi,

My company is in the process of deploying a Wireless Internet infrastructure based on the UMTS-TDD technology. Everything seems to be going well, but I can’t seem to be able to get a company that can provide SIM cards for this product/service.

I’ve attempted contacting Gemplus a couple of times but no reply whatsoever. I’d appreciate assistance from anyone with information on this technology as well as how to obtain the SIM cards.

Thanks
Tope Fash