The first was that somebody apparently registered the card I originally purchased and then returned it. The cards can only be registered once, so I had to return the card for a new one. After that, registration went fine.
The second had to do with VPN. Normal internet access worked fine. VPN with a Nortel IPSec client worked well also. However, when I attempted to VPN into another network using the Microsoft PPTP client, I recieved a 721 error message - indicating that the connection may not support GRE packet traffic.
That last one is a bit of a killer. If I get it resolved, I'll follow up with another post. If I do, the pay-as-you-go plan will definitely be worth it. If not, the stick is another candidate for the technology scrap heap. At least I'm not stuck with a year long plan and a monthly fee.
Who knows. Sprint just bought out Virgin Mobile, which supplied the plan. Perhaps Sprint will manage to get the VPN issue straightened out.